general question: do all modern levis have a number on the inner button? everything about these jeans looks ok except the number. Sorry for offtopic : r/VintageLevis
Vintage Levis Button Numbers aka Levis Factory Codes - St Cyr Vintage | Vintage levis, Denim shirt with jeans, Levi
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Vintage Avenue - FOR REFERENCE LEVI'S BUTTON STAMPS... | Facebook
How To Determine Production Date of Vintage Levi's 501 Jeans