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Try @31TRUM ?
I have one of his on a Panerai and it’s a belter. Just made me a couple of wallets so still in action (and damn fine they are too).
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Hirsch make pretty good straps, used them as replacements on my Breitling when it was on a leather strap
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Check out Two Stitch Straps.
They aren't the cheapest (although not the most expensive either), but they are individually handmade to a much higher standard than the usual stuff and a Tudor is worth spending a bit more on a good strap for IMO. If you ask I am sure they will make one to your exact specification as they have done with me a few times (eg a particular taper, or a different combination of colour / stitching style / stitch colour than their standard offerings, etc).
I like this one and I think it would look pretty nice on a Black Bay. Their standard taper on that one is 22 to 18.
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Not sure about the tapering but Aliexpress has straps so cheap you can just buy a bunch to see which you prefer
https://www.aliexpress.com/item/1005001679822264.html
Speaking of Black Bays and straps, I'm looking for something for mine which should be easy to find but I'm struggling.
Want a fairly chunky leather strap, either dark brown or very dark/distressed grey, 22mm lug tapering to 18mm and pretty plain.
I'm finding quite a lot on US sites but not finding much in the UK. Any suggestions?