Welcome to the world of vintage Seiko.
Looking at your watch I noted the following:
1. Bezel insert looks to be correct but the lume pip at 12 appears to have been replaced.
View attachment 1138185
2. The crown should be a large spline crown on these earlier models. The crown on your watch appears to be a later replacement.
View attachment 1138192
3. The crown should screw down with around three turns. The problem with your watch may not be the threads in the crown but more likely on the crown tube. The crown tube can be drilled out and a new one inserted.
4. The hour and minute hands look to be correct. The hour hand seems to have the correct slant in towards the lume. The seconds hand however looks to be from a 7548 Seiko diver. You could try shining a light on them and see if they glow a similar colour to line plots on dial.
Correct seconds hand shown below:
View attachment 1138213
5. The dial looks to be correct with some fading to the 'water' and 'resist' writing which should normally be a dark red colour. Bevel around date window present. The hour lume plots have taken on a creamy colour which is common in the earlier versions.
6. Case looks to be in good condition. It has the wider cut out around the crown found in the earlier models. It's hard to tell but the upper surface of lugs seems to still have some of the circular brushed finish.
View attachment 1138212
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