Creating a no sew DIY leather watch strap is a great project for learning a more complex process, while still being simple enough to tackle in a single afternoon!
Leather Watch Strap : 12 Steps (with Pictures) - Instructables
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Leather Watch Strap : 12 Steps (with Pictures) - Instructables
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Make Your Own Easy & Inexpensive Leather Watch Strap (No Sew)
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A Complete Guide to Leather Watch Straps - ZULUDIVER