Is this Submariner 16800 Fake?

[SamAlva]

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[/PHP]Hello everyone, first of all I hope you’re doing great! I found this Rolex which I presume to be a submariner 16800 listed on FM (where I’m from, there are many vintage watches going around, so It shouldn’t be a cause for concern). I’ll be honest, I’m a bit out of my depth authenticating this one, since I’m mostly an omega collector. I tried seeing if the watch ticks 8 times per second as to try to see if the frequency was right, I’m almost sure it does, but a second opinion on this matter would be greatly appreciated. I’d like to know if at first glance it looks all right. I know with vintage Rolex one only knows the whole truth once you open the watch, but still I’d like to know if it looks all right. Thank you very much for your help, you guys are the best!!