I was looking for an ETA757 or something like it as a donor for a watch Marrick asked me to repair.
This one had a similar aspect and a Staybrite case, so I took a risky punt and landed it for £12.25
I haven't yet identified the movement (and just this minute snapped it before I go and look it up) but it isn't an ETA757.
So I'll just have to keep it. Oh dear.