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I think you'd be better off with small but large would also work, you'd just have more of a tail to tuck under.

Edit: Just remembered you're the strap hoarder so you'll probably be more aware what would fit than me!
Small is 135-150, so would be too small for me.

Do you have a modern buckle?

Wishing you well.
 
Here’s what I think:

I got two modern buckles, the leather ones. I tried them on and they fit a size 2-3 in solo loops for 41/42mm.

Both of them are the small size modern buckles, and I fit them on the second to last hole.

If I got the medium size, I’d probably fit on the first or second hole, but I haven’t tried them out yet.

My wrists are 5.3 inches long.
 
As per the title.

I have 165MM wrists, and I can buy a large modern buckle.

Not sure if it would be too big big?

Thanks.
 
As per the title.

I have 165MM wrists, and I can buy a large modern buckle.

Not sure if it would be too big big?

Thanks.
I think it cannot be too big; you have wrists larger than me.

Plus it can fit comfortably and just fine, if you got the medium you'll squeeze in it too tightly as that is the highest wrist size you can wear.
 
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