Longines 27m - advice needed

Hi folks,
Another chapter in the on-again off-again search for a dress Longines...

Found this one for sale, and so far I think
a. hands look correct
b. dial is not a redial (and I like the dial)
c. movement is a 27m as stated by the seller, which I'm compared with Dr Ranfft's website



I wanted to ask a question specifically about the movement - it seems there's a screw head missing? (adjacent to the 'gin' of "Longines", arrowed).

Is this a big deal - ie. it's problematic cos the movement can't be removed for servicing, or the loss makes the movement go wonky somehow? Or is it a minor issue - one where the watchmaker can simply replace the screw and the watch is salvageable? A major (and troublesome) fix, or an easy fix?

And are there any other red flags that I've missed? Advice welcome, thanks in advance!

Missing or broken off 😗

Assuming that it's just missing, I wouldn't expect it to be hard to find a replacement.

I really do like that watch's appearance.

Thanks everyone!

Think I'll pass - the potential hassle of repairing something like this is not for the faint-hearted like me at the price the seller is asking. (Ok I freely admit I'm a wuss)

In case anyone else is keen to take a shot, here's the link - have fun!