u/Au-to-graff

I bought these 3 Seiko.

(pict. 1) Seiko 6030-5280 : bought in Vietnam, comes from a deealership specialized in second hand, it is in a very good condition. I find it tiny on my wrist, but it probably is just a matter of habit.

The back of the watch indicates 6030-5280 whereas the front dial shows "6030-5340 T", so I don't know which is the right one.

The next two are broken and were part of a 60€ broken watches bundle I bought online.
I would like to repair them, but I know nothing about that and I am looking for advices.

(pict. 2 & 3) Seiko 7143-500A : it is my favorite, in a very bad shape, dial is damaged, the inside seems to have been flooded, the crown is missing.

(pict. 4 & 5) Seiko 8122-6020 : I don't like it that much, it seems in OK condition except for the damaged glass. If I fix it, I will gift it to a relative.