Have you ever heard of the Hermès horseshoe?
A horseshoe stamp (found on the left side of the front-facing Hermès logo) signifies that a Birkin or Kelly bag was made by Hermès to the specifications of a top collector. In other words, these bags are a small subsection of an already extremely rare and in-demand handbag style, thus making it even more expensive than your average Birkin.
How much more? It is said that at auction, a horseshoe stamp can increase the auction estimate of a bag by up to 200%. These personalized touches indicated by the stamp can include anything from a contrasting interior to bicolor or tricolor exterior, contrasting stitching, or a brushed finish to the hardware. 
This horseshoe-stamped crocodile Birkin, which was estimated to go for anywhere from $80,000–$100,000.
