Short answer
Hermes phony sac 18 mixes English and French. Sac means bag. The phrase points to a counterfeit Hermes bag sold as 18 cm wide. Hermes does not list an 18 cm Kelly or Birkin. The Kelly line starts at 20 cm with the Mini Kelly II and runs to 40 cm. The Birkin starts at 25 cm. A listing that claims 18 cm is a measurement error or a copy. Four checks settle the question: blind stamp, stitch, hardware, leather.
What 18 means in a Hermes size
Hermes names sizes by width in centimeters. Kelly: 20, 25, 28, 32, 35, 40. Birkin: 25, 30, 35, 40. The Mini Kelly II measures about 20 cm wide, 12.5 cm tall, and 5.5 cm deep. Third-party factories shrink the mold and market the result as an 18. Ask for a photo of a tape measure laid across the base. Compare that number with the stated size.
Blind stamp and date code
Hermes marks each bag with a blind stamp: one letter for the year, plus a shape in older years. The stamp sits under the front flap or on the strap lining. Auction and resale records show a square around the letter for 1998 through 2014 and a circle for 1971 through 1997. A copy shows a stamp pressed by machine. The edges of the letter look sharp and the depth stays even.
Stitching
Hermes uses a saddle stitch. Two needles pass linen thread through one hole from opposite sides. Stitch count runs about 8 to 10 per inch. Look at the inside seam and the back of the flap. Machine lock stitch gives one straight row outside and looped thread inside. Copies pass on the front and fail at the back seam and the strap ends.
Hermes Unauthentic Sac 18: A Comprehensive Guide
Hardware
Hermes hardware is brass with gold or palladium plating. The turnlock on a Mini Kelly II has weight. Engraving on the plate is cut into the metal. Copies stamp the letters in relief or cast them shallow. Check the feet, the sangle plates, and the zipper pull. Hermes uses riri and Eclair zippers on many models. A plastic zipper tape or a nylon coil marks a copy.
Leather
Hermes runs Togo, Epsom, Clemence, Swift, Barenia, and Chevre. Epsom takes a pressed grain and holds shape. Togo shows small bumps and softens with use. Copies use split leather with a plastic finish. The surface reflects light in a flat sheet. Smell gives a second signal. A new bag smells of tannery leather. A copy smells of glue and solvent.
Price, papers, and receipts
Boutique retail for a Mini Kelly II runs into four figures in US dollars, and resale asks more. A listing at 300 to 900 USD is a replica. Boxes, rain covers, dust bags, and receipts cost little to print. Papers do not verify a bag. The bag verifies itself through the stamp, the stitch, and the metal.
Questions to send a seller
- Send a photo of the blind stamp with the flap lifted.
- Send a photo of the inside back seam at 3x zoom.
- Send the base measurement in centimeters.
- State the year code and the leather name.
- Send a weight in grams for the bag with hardware.
Answers that stall or repeat marketing text mark a seller to skip. A seller with the real item answers with numbers and photos.