Bracelet width vs. lug width

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Question: typically, how much smaller is any bracelet end-piece than the lug it’s supposed to fit into? Thanks.
 
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I would never fit a 19mm on a 20mm. The gap is too big for my taste.
.1mm to .3mm is visually ok to my eye. I'm sure respected mfgs are even tighter.
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Supposedly, the gap on flat-links is .3mm. Looks bit too large for my eye: