Need help identifying this 1950s Seamaster

Hi All - Wondering if anyone can shed some light on this old Omega Seamaster that belonged to my grandfather as I can't see any examples like it anywhere...

- The Movement is 501, from 1956 (Serial Number is 15352577).
- Case Back is 2846
- The face has 'T Swiss Made T' across the number 6 (not below it). From other posts on this forum it looks like this designation didn't come in until 1960, which seems not to match the movement year.
- There are Tritium dots next to of 3, 6, 9, 12

Is there a chance that the dial/face has been replaced after it was purchased? If so is the current dial genuine? What dial would have been there previously?

I'm unable to get any more photos at this time as the watch is currently being serviced (it hasn't run in 25 yrs).

Any insights/ info on this watch would be appreciated!

I haven't seem much of this dial variation.
Probably won't help much but here is my 2846 no lume dial for reference from around the same time period

Thanks all - wondering what the whole point of repainting/ refinishing the dials was though! Original versions definitely look much better!

Of course they look better ! These guys have all the nice ones ! There collectors after all.

Yours could be cleaned up and look nice again ..... if you can get it running. First thing is the service ... post pictures after you get it cleaned and running.

Have to ask,....was it really your grandfathers ?

Yes it was - currently getting it serviced to give to Dad for his 70th and was keen to get some background info on it. Will post some better pics once it comes back from the service. They are putting a new plexi front on it so should be easier to see when it’s scratch free

Hi BenR and welcome.

Too bad about the dial. This case model and dial variant in particular are very desirable. Omega itself reissued it on 2018 and many (myself included) really like this kind of 50s Seamaster.

Mine says hi: