Hermès HSS Birkin 25: Special Order Gris Mouette & Blue Paon Epsom Leather
The Hermès HSS Birkin 25 in Gris Mouette and Blue Paon Epsom Leather is a distinctive interpretation of the iconic Birkin, combining a sophisticated grey exterior with an expressive blue accent through Hermès’ Special Order program. Its compact 25 cm proportions, structured Epsom leather, and carefully coordinated two-tone construction make it a particularly distinctive example of Hermès personalization.
A documented example of this exact configuration was produced in 2017, carries an “A” date stamp, and measures approximately 25 × 19 × 13 cm. SACLÀB describes the bag as a made-to-order HSS Birkin crafted in Gris Mouette and Blue Paon Epsom leather, with brushed Palladium Hardware.
The Meaning of HSS: Hermès Special Order
The horseshoe stamp, commonly abbreviated as HSS, identifies a Hermès Special Order piece. These handbags are created through Hermès' personalization program, allowing selected clients to specify combinations of colors, leather, stitching, and hardware within the options offered by the house.
The horseshoe stamp is placed discreetly beside the Hermès branding and distinguishes a Special Order handbag from a standard-production Birkin. Sotheby's describes HSS bags as custom-made Birkin and Kelly handbags whose defining characteristic is this horseshoe marking.
The Special Order concept makes the two-tone configuration particularly meaningful: Gris Mouette and Blue Paon are not simply decorative accents but represent a deliberate client-selected combination.
Gris Mouette and Blue Paon: A Refined Color Combination
The principal color combination is built around Gris Mouette, a sophisticated grey, and Blue Paon, an intense blue-green shade.
Gris Mouette provides a restrained foundation. Its muted character allows the architecture of the Birkin to remain prominent while creating a versatile neutral base.
Blue Paon introduces contrast and visual depth. Rather than making the bag entirely monochromatic, the second color emphasizes the handcrafted construction and gives the silhouette a more individualized appearance.
The pairing of a soft grey with a saturated blue creates a balance between understated elegance and expressive color. This type of contrast is one of the attractions of HSS handbags: the owner can combine shades that communicate a very different personality from a conventional single-color Birkin.
An auction record for another HSS Epsom handbag demonstrates that Gris Mouette has been used in Special Order two-tone configurations; Sotheby's documented a Gris Mouette and Black Epsom HSS Kelly 32 with Palladium Hardware.
Epsom Leather
The Birkin is crafted in Epsom calfskin, a leather recognized for its finely pressed, regular grain and structured appearance.
Epsom's pronounced grain gives the surface a crisp visual texture while helping the Birkin maintain a relatively defined silhouette. The texture also makes the two colors visually distinct, allowing the Gris Mouette and Blue Paon panels to retain clear boundaries.
Epsom is frequently used for structured Hermès handbags. Sotheby's documented Epsom Birkin 25 examples measure approximately 25 × 20 × 13 cm and feature a tonal Chèvre interior, illustrating the proportions and construction associated with this size and leather combination.
The Compact Birkin 25
The Birkin 25 represents the compact end of the classic Birkin family.
The documented HSS Gris Mouette and Blue Paon example measures approximately:
Width: 25 cm
Height: 19 cm
Depth: 13 cm
Country of origin: France
Production year: 2017
Leather: Epsom calfskin
Configuration: HSS Special Order
Colors: Gris Mouette and Blue Paon
Hardware: Brushed Palladium
The proportions make it substantially more compact than a Birkin 30 or 35 while retaining the recognizable construction of the larger versions.
Structured Architecture
The Birkin's appeal comes partly from its carefully balanced architecture.
The two rolled top handles frame the opening, while the flap extends across the upper portion of the bag. The side gussets create the characteristic trapezoidal profile, and the base gives the bag enough structure to retain its shape.
Epsom leather complements this design particularly well because its embossed grain and structured character reinforce the crisp edges of the silhouette.
On a two-tone HSS example, these architectural elements become even more visually interesting because color can emphasize different portions of the construction.
Palladium Hardware
The documented Gris Mouette and Blue Paon HSS Birkin 25 is described with brushed Palladium Hardware.
The cool silver-toned finish provides a clean contrast against both colors.
Against Gris Mouette, Palladium creates a subtle monochromatic effect. Against Blue Paon, it becomes more pronounced, giving the saturated blue a crisp metallic counterpoint.
The principal hardware elements include the familiar Birkin turn-lock, front plates, rings, feet, and other metal fittings associated with the design.
The Signature Birkin Closure
The Birkin's closure system is an integral part of its identity.
The flap passes through the front straps and can be secured with the central turn-lock mechanism. The lock and clochette are among the most recognizable details of the handbag.
The documented HSS example includes its lock, keys, and clochette, along with the original box and dust bag.
These accessories also contribute to the complete presentation of a collector-oriented Birkin.
Interior Organization
The Birkin 25 is compact, but the interior is designed to accommodate carefully selected daily essentials.
Depending on the individual production example, Birkin interiors commonly feature an open central compartment, a zippered pocket, and additional flat pockets. Comparable Epsom Birkin 25 examples documented by Sotheby's feature tonal Chèvre leather interiors.
The relatively compact footprint encourages a streamlined approach to carrying. A phone, cardholder, compact wallet, sunglasses, keys, and a few smaller personal items can generally be organized within the bag according to their dimensions.
The Importance of the Two-Tone Construction
The defining characteristic of this HSS Birkin is not simply the use of two colors but the deliberate combination of Gris Mouette and Blue Paon.
A traditional monochromatic Birkin allows the leather, hardware, and silhouette to define the overall appearance. A bi-color Special Order introduces another visual layer.
The two shades can emphasize the handbag's panels and construction while creating a distinctive color rhythm. Gris Mouette keeps the overall appearance refined, while Blue Paon provides a more energetic accent.
This balance allows the bag to move between understated and expressive styling.
Styling the Gris Mouette & Blue Paon Birkin
The color combination offers considerable styling flexibility.
Gris Mouette works naturally with neutral wardrobes, including:
Black
White
Cream
Taupe
Beige
Navy
Charcoal
Blue Paon can then become the coordinating color accent. Clothing or accessories in blue, teal, green-blue, or complementary neutral tones can emphasize the secondary shade without overwhelming the bag.
For evening styling, the compact 25 cm silhouette pairs naturally with tailored separates, dresses, and minimalist evening clothing. During the day, it can provide a colorful focal point against a neutral wardrobe.
Handcrafted Character
Hermès handbags are made with significant attention to construction and finishing, and the Special Order format adds another dimension of personalization.
The exact appearance of an individual Epsom Birkin can vary according to leather grain, stitching, color placement, hardware finish, and production details.
The HSS configuration therefore represents more than a colorway. It records a particular combination selected within Hermès' Special Order offering.
Sotheby's notes that HSS clients can select among available leathers, colors, stitching options, and hardware finishes, although available choices change over time.
Care of Epsom Leather
Epsom leather benefits from careful handling.
Its textured surface should be protected from excessive moisture, oil, cosmetics, and abrasive contact. Although the structured grain is relatively distinctive, it should not be treated as completely immune to scratches or staining.
For long-term storage, the bag should be kept in its original dust bag in a cool, dry environment away from prolonged direct sunlight.
The structured form should also be supported appropriately during storage so that the bag is not compressed or distorted.
Caring for Palladium Hardware
Brushed Palladium Hardware should be protected from unnecessary abrasion.
Avoid placing the metal fittings directly against rough surfaces or other hard objects that could produce scratches. A soft, clean cloth can be used for gentle surface care.
Particular attention should be given to the turn-lock and other areas that receive frequent handling, as repeated contact with jewelry or hard accessories can gradually affect the finish.
Original Accessories
The documented HSS Birkin 25 was accompanied by several original accessories, including:
Hermès box
Dust bag
Invoice
Lock
Keys
Clochette
Complete accessories can enhance the presentation of a Special Order handbag and help document its original configuration.
Collector Significance of HSS
HSS handbags occupy a distinct category within the Hermès secondary market because they combine the recognizable Birkin design with a customized configuration.
Sotheby's notes that Special Order bags represent a relatively small portion of Birkin and Kelly handbags appearing at auction and are distinguished by their horseshoe stamp.
However, the desirability of individual HSS combinations varies according to factors such as color pairing, leather, hardware, condition, age, provenance, and completeness of accessories. It is therefore more accurate to consider each HSS Birkin individually rather than treating all Special Orders as identical.
A Distinctive 25 cm Statement
The Hermès HSS Birkin 25 in Gris Mouette and Blue Paon Epsom Leather combines compact proportions with a highly individual color configuration.
Gris Mouette provides the sophisticated foundation, while Blue Paon introduces contrast and personality. Epsom leather reinforces the structured character of the Birkin, and brushed Palladium Hardware completes the design with a cool metallic finish.
The result is a Birkin that retains the unmistakable character of the classic silhouette while expressing the individuality made possible through the Hermès Special Order program.
Conclusion
The Hermès HSS Birkin 25 in Gris Mouette & Blue Paon Epsom Leather is an elegant example of personalized Hermès craftsmanship. Its 25 cm proportions make it compact and versatile, while the structured Epsom leather gives the bag a crisp and defined appearance.
The pairing of Gris Mouette and Blue Paon is the central visual feature, balancing a sophisticated grey with a vibrant blue-green tone. Brushed Palladium Hardware adds a contemporary metallic contrast, while the HSS horseshoe stamp identifies the bag as a Special Order creation.
With its distinctive two-tone construction, classic Birkin architecture, Epsom leather, and documented 2017 production, this configuration represents a particularly individual expression of the Birkin 25—one that combines the timeless structure of Hermès with the personalized character of a Special Order piece.

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