
Instructions for measuring watch strap size - Leonardo.vn
Many customers are hesitant to order watch straps because of the size issue, afraid that the strap they buy will not fit their watch. Actually it is very simple, you just need to measure 2 dimensions, the first is the connecting point between the leather strap and the watch, the second is the watch clasp as shown in the illustration. 
Keychain size

Leather strap & watch connector
The common sizes of watches are usually:
1. 22 - 20 mm
2. 20 - 18 mm
3. 18 - 16 mm

