Old Omega Seamaster - Help me with the basics

Hi - I've got this old Omega Seamaster that my grandfather wore. It's been in storage for years, (maybe decades) and I'd like to start to wear it, so I need a bit of a crash course in what the heck I need to do.

I did wind the watch. The dial appears to only pull once and that moves the clock hands and changes the date. I turned it only clockwise (away from me) I noticed that the date changes when the time reaches about 1:15. While it seemed to keep good time initially, after about a day the watch did seem to lose some time.

Can anyone help me identify the possible year of production of this model?
Does it need to be wound daily? How much?
Is there any service or anything I should do, to be sure it keeps good time? If it needs service, anyone have any background as far as what that goes for.
I'd like to get a new band, this elastic bracelet bothers my arm.

Any other tips? Ideas? I don't really know what other questions I should be asking in order to get this thing in good working condition again.

Thanks

Can find a watchmaker through the AWCI Find a Professional.

Get the wrist scum off the case and clean that up. Replace or polish crystal. Service movement. Replace sweep hand

Mid 60’s

At the AWCI SITE. If you find someone. Check credentials to see if they’re more than a battery changer.

Get an estimate and then ask here. Maybe about $250-$300 for cleaning now. Crystal replacement will add. Polishing original less if just scuffed

https://awci.memberclicks.net/find-a-professional