Fake or not?

I'm trying to prepare for my first Speedy Pro purchase. I've owned a Mark 40, and a reduced, but with the amount of fake Pros I want to get better at spotting things that are wrong. I almost got burned a couple weeks ago and was saved by eBay's Authentication. I think this watch might be legit, with the incorrect bracelet. I'd like to know members thoughts on it's authenticity and if there are things wrong, what they are. I greatly appreciate any and all feedback. Thank you.

I guess the long s/r dial made me start to wonder if it wasn't a marriage piece. Seller stated it was a late 70's watch, but I thought that it should be at least mid eighties, but I am just starting to learn things so your help is very appreciated.