screw down crown? if not a huge mistake?

No it's doesn't have a screw down crown. I don't believe it categorized as a diver. As far as my knowledge goes screw down predominantly are for divers. The watch is however top class mate.

What is the length of the wristband bracelet?

Unless you have tiny or giant wrists bracelet will fit once it has been sized. Any jeweler will do it for 10 $. If u have tiny wrists the watch is probably too big for you anyway. You'd probably have to be a giant for the bracelet to be too short. I have 6.75 Inch wrist and plenty of extra length on bracelet out of box.

Does this come with the strap/band sizing option? My wrist is 8.5 inches and I have to check if the strap will fit

Hello there, This bracelet will definitely fit your 8.5" wrist after resizing it. All brand new Tissot watches come in their standard sizes and will need resizing from a watchmaker. Best regards, Golden Time Jewelers Tissot Authorized Dealer

Tissot Men's Gentleman Auto Swiss Automatic Dress Watch with Stainless Steel Strap, Grey

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