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Perforated straps here
https://www.watchgecko.com/leather-watch-straps?custom_strap_style=3015
I'm sure some googling may derive more.
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Reverse image search found the original article...
"My strap is from the guru, Giuliano, and it mocks vintage Corfam. Plus, I paired it with a 25 Euro Omega pin buckle that I picked up at the local boutique; it has to be one of the cheapest things in the shop!"
Edit: moar-
"My first email was to one of my favorite strap makers, Giuliano (he advertises on the Chronocentric OnTheDash Chronotrader forum), as I wanted to order a black leather Corfam-look strap with racing holes. Giuliano had saved my Dad’s measurements from an earlier order and the 18/16 strap was underway! As you can see, it turned out beautifully – as always. A big thanks to the “custom tailor” from Italy!"
Where can I get this strap/this type of strap from?