Congrats on getting this heirloom and welcome to OF. The watch looks great. Have a watchmaker repair and service the movement, but ask him not to polish the case. In the US, a maintenance service is not usually called a revision, but a "full service", "overhaul", or "clean, oil, and adjust" (COA). Your watch is currently unpolished, with nice sharp edges, just the way collectors like them, so leave it that way and tolerate whatever minor scratches your father gifted you.
There should be different crown positions for changing the time and date, so you might need to experiment with that. Or just ask the watchmaker to explain. It's best not to use it too much before having it serviced, since the lubricating oils in the movement will have dried up over time.
If you can't find the correct end-link immediately, you can transfer the watch to a nice leather strap in the meantime. It will look great.
As mentioned by
@chipsotoole, the serial number on the movement will provide an estimate of when the watch was produced using a table of Omega serial numbers (just Google it). And for $150 USD you can order what is called an Extract of the Archives from Omega for your specific watch, which will most likely give you the month, year, and location where the watch was delivered. If you'd like to do that, you will need to go to a local Omega Boutique or contact SwatchGroup customer service by email, since one can't order an Extract online from the US.