This is a pre-Swatch Omega. Could be about 40 to 45 years old. I have never had occasion to try to locate replacement parts for one of these. But I rather expect finding certain parts would be difficult/impossible. Plus, I rather suspect a lot of repair shops won’t touch them. “Working order!” Watch collectors usually wonder for how long it will be before parts are needed. If your friend is interested in it at $200.00, you might check out completed auctions on eBay to get an idea of what people are prepared to pay for similar vintage quartz watches. Or you might jump at a $200.00 offer.