just bought my 1st vintage watch omega seamaster 1969 and i have a lot of question

I just bought an omega seamaster calibre 750, 17 jewel rotor and i have a couple of questions about it.

How do i adjust the day and date? I figured out to adjust the date is by pumping the crown, was i right? But how do i set the day?

To adjust time i just have to pull the crown and i do not have to unscrew it. Would it be still waterproof even it is not a screw type crown? Is there such option for 1969 seamaster that does not have a screw type crown?

There is 3 position for the crown. 1st is when the screw is pushed to the watch when i turn it clockwise it winds manually, 2nd position is adjusting time and 3rd doesnt do anything. Pump it it will adjust date but not day.

when i bought it the seller said restoration was done by tim mackrain. is he known for his works?

thank you very much

The day only changes by rotating the crown so the hands go forward 24 hours (as if a day has past).

NEVER assume any vintage watch has any water resistance.

I love how the paperwork says Dial: Original Dial Restored excellent condition. Original and restored in the same sentence....Jeeez!

Well, I suppose the metal underneath the paint is original 🙁 My opinion of Tim has gone downhill recently, what with all the replacement hands and dodgy redials.