Need help to verify insert on 1680

[Kchantank]

Hi everyone,

Thanks for your time in helping me out.

About to purchase this watch but want your views on the insert & dial while your at it.

There’s so many info I get confused

Would this be classified as a MK4 thin font flat 4 76-88 or a service bezel?

I read and looked online seems that the service bezel are thinner?

Thanks again everyone

Best,
Kris