1993 Quartz Seamaster 120 - Several Questions

Purchased my first Omega a couple weeks back for around $400. Bought it used on reddit. I think it is the watch in the link below?
https://www.omegawatches.com/en-us/watch-omega-seamaster-120-st-396-1501

I took it in to get pressure tested at a jeweler that is considered an Omega Service Center and they have a watchmaker. It passed, however, the watchmaker told me that she would probably still not take it in the water because it is a vintage watch and that it deserves to be "babied" because of its age. She did, however, tell me that it was a very cool watch and she had not seen another one like it.

Any thoughts on this? I have no clue about service history besides that it got a new battery right before I purchased it. I asked it about sending it back to Omega for their $200 resistance service, but she said she wouldn't bother if it keeps good time (it does). Even though it's old, I expected to be able to take it in the water. It is a dive watch and the metal and crystal seem to be in solid shape.

Some other random questions:
-Is there anything quirky I should know about setting the time and date on this watch, or is it pretty straightforward?
-I've never owned "high end quartz" before. Anything I need to know about servicing?
-Any rough estimate on value?
-Any other information would be greatly appreciated.

We have a similar one in our collection but it's hard to gauge the size of yours by your pictures. Ours is men's size with bracelet and wave dial. We also wouldn't take it diving or swimming unless it had it's seals replaced. Just not worth the risk for almost zero gain. If one must wear a watch while in the water there are many less expensive options to choose from than a vintage Omega.

Ours...

Thank you Archer. As far as the movement goes, it seems like this either has a 1438 or 1538 (I am not going to remove the case back on my own. I cannot find a manual for the 1438. Do you know of any differences in care or function that I should be aware of? Thanks