ไม่ใช่เซียน แต่ไปหาเจอจาก Comment ของคุณ mrssparkles ใน TPF มาค่ะ ลองอ่านดูนะคะ :)
As for variation in the stamp, in terms of clarity, font thickness, etc ... there is. Even in the same year! Yes, it's absolutely possible that the stamp is not clear. The type of leather (skin) makes a big difference in how the stamp looks. In smooth skins like boxcalf, swift, vache natural, barenia, just to name a few, the stamp is clearer. The stamp on grainy skins tend to look smudged.
Credit : mrssparkles from TPF
Full story :
http://forum.purseblog.com/hermes/hermas-stamp-604818.html