Barton's rubber is nice, but I think I've come to like a brown leather for mine. Strapsco straps makes a 21, but right now I have a ritchie strap, seems higher quality than strapsco. 21 is a pain for sure.
The strap is not very great, but the watch is! Its one of my oldest watches, and its still my favorite. But i'd really recommend switching that strap, especially for smaller wrists. I tried breaking it in for a month and didnt have much success.
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