This seems like a steal. The price is very reasonable, the watch in good condition.
I am not an expert enough to point out any obvious discrepancies from the listing. I do know and agree that winding bridges break, so I would not be worried at all, if that bit was in silver while rest of it was in gold - I’ve done this plenty of times myself. It is simplest to just chuck the the winding bridge and replace it whole.
SEL’s look decent. I am not anal about them, though. Plenty of people who are, on this forum. Their opinion might differ from mine.
For that kind of money, I
personally would snap it up, put it on a timeographer and then do one of the following:
(a) nothing because nothing needs to be done;
(b) regulate to get accuracy to +/- 3s per day;
(c) strip it apart, clean and service the movement, put it back together and do (b);
(d) put in a new Seagull ST2100, do (b), do (c) on the ETA and put the reassembled and regulated movement into my drawer - use it when needed.
As you say, many of us look for ETA or A2836 reps, because they are easy and cheap to repair. They are a solid base. And this watch looks fine. It does not have the fancy stuff newer Rolexes do (no rehaut engraving, no LEC as far as I can see, no ceramic insert), but that is period correct, so if it doesn’t bother you, go for it. It is certainly a lot better than that hulk you used to have
.