20mm or 22mm will work on a 21. Depends on what look you prefer.
I have smaller-ish wrists, 6.5" (16.5 for you metric peeps).
The Crown and Buckle Chevron might be worth looking at for you, infinitely adjustable.
My personal favorites are the OG ZuluAlpha straps. Infinitely adjustable, unique buckle, owner and his small team still do everything by hand, and he supports some great veterans charities.
I still need up cutting down the length sometimes, but a sharp set of shears, and a lighter will make short work of trimming stuff down.
Tell your friend to get some thicker skin...., you can block ppl, or even better not read posts you don't like lol.
😲😉🤏🏻😜😝🫢
And welcome to WC, it's waaay better here than any place I've ever been on.
I believe Uncle Seiko also does one as well, altho he might only offer blasted/brushed variants.
As others have said, that boring field vibe means it goes with everything, and is EXTREMELY versatile.
If you want to spice it up, throw it on some fun graphic straps. And yes it does have long L2L, but for what it cost me when I bought mine, I ain't complaining....🤏🏻😜😉😲🤐.