I bought this strap for my Grand Seiko with 20mm lugs. I'm a fan of straps, not metal bracelets. This strap did not fit between the 20mm lugs. It was too wide. Not only was the leather strap too wide, but the springy metal tube was too wide to fit between the lugs. I checked my order and ordered size 20mm. I had to remove the included "Quick Release" spring bar, trim some leather and use standard 20mm spring bars for a decent fit. It was a bad experience to say the least. The only reason I gave it 1 star is the skin and the opening mechanism.
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