I am an OCD guy and can’t stand lesser quality straps and buckles. I always try to find third party straps with the same taper as the original strap so I can use the OEM buckle. Seude looks phenomenal but I prefer flatter ones without inserts.
IWC boutique carries a lot of options that you can play around with. I got my canvas straps from boutique for both my IWCs.
Good luck my friend! my roadster has gotten much more wrist time after the mod. Feels like a new watch once again. And you can still wear it with your OEM bracelet.
I can share more details about the procedure and the placement of the holes when you can find someone to do it in SF.
I can say it’s definitely worth the effort!
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