Omega Seamaster 120 enquiry

Hi guys. I’m relatively new to all this and have a Seamaster 120 that I’ve owned for a couple of years. I was alway intrigued by the fact that it has a white dial which to my eye looks original, but I can’t see another white dial example when I do a search. I have attached the best photos I can do and was hoping someone out there could help me to date and value the watch please. The bezel seems to be aluminium and a lot of the teeth have worn down but other than that it’s in good order and running well 601 manual wind movement. Thanks so much in anticipation

I'm not an expert on these, though I do have one (where I paid my 'noob tax', ouch), but something doesn't look quite right about this. I haven't seen a 6xx movement in one, but perhaps it's a later model? Mine's a '68 with a 5xx.

Oh boy...

There are def 601 manual and also auto versions out there thanks