6424? Opions appreciated

[tbkbabab]

Am a new member and was pointed in this direction because of below watch.

Long story shortish, I purchased this in London about 25 years ago I think for about 5 GBP. I presumed someone had put a Rolex dial and crown on another watch and bought it on that basis, they crown never screwed down properly so I never really wore and it got put in the back of a draw.
Decided I would have a major reduction in the size of my watch collection and got everything together to decide what would be going and remembered this one, still presuming it wasnt actually a Rolex.
Earlier this week took the back off a 80's Seiko quartz to check what battery it took and see if could get it going and sell it and at the same time I thought I would try to take the back off this one just out of curiosity really, it came off just using my fingers if that hadn't worked I probably wouldn't have bothered.

Pictures below which now after a bit of digging seem to point to this actually being a 6424 with a 1210 movement but opinions appreciated.
Case isnt in great condition and the lume dots on the dial look a little odd.
The watch obviously needs a major overhaul but would like to know what people think before deciding to spend what no doubt will be quite a bit for the work.

Well pictures would be here but when I try to add it says I need 10 posts to add a link or am I being a numpty?