I had a similar reference in steel from the later 1950s (now on my brother in law's wrist) and I found it to be a very reliable and enjoyable watch. I paid about the same as you are considering, about two years ago. Love the movement and it has a good reputation (and was used forever!) You probably didn't find it on the Longines automatics thread because, well... It's not an automatic!
I have questions about the crown, which looks to have a slightly different shade of gold, and about the subseconds dial, which looks a bit off, maybe repainted, and has west from an incorrectly set hand. Case looks good to me. I don't like the dialpatina, but you might! That is a very personal issue...
Several Longines with this movement have been posted for sale here this month at similar prices, and they were much more interesting to my eye. I personally think you can do better! More experienced members please chime in!
Here's my former friend, I still have visitation rights:
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