Seamaster Pro quartz (2541.80.00, 2265.80, etc)

Something that might be relevant: Since you expect the recipient to dive with the watch, you'll almost certainly want to have it serviced and pressure-tested. If you send it to Omega, they should also restore the cosmetic appearance to be as close to "like new" as possible as part of the service. They'll also replace the movement with a new one I believe. So if you go that route, then you don't have to worry so much about the watch's current condition. I believe current service fee is USD 500, so that gives you around USD 1350 to work with. I don't know about Canadian Customs' Fees, but you might could squeeze under that with Japanese sellers. There was a recent thread here that listed many Japanese vintage dealers, some of which have web sites and will ship abroad.

Edited to add: And if you're willing to consider the mid-size version, you can definitely find those for well under USD 1350. Even on eBay and Chrono24.

Are you only interested in purchasing directly from OF members? There seem to be plenty of options on eBay, Chrono24. Just to pick two (though there are plenty of others):

eBay: OMEGA Seamaster Professional 300m Full Size 41mm Quartz Date Watch 2265.80 w/Box - US $1,555.00

Chrono24: Omega Seamaster 2265.80 - US $1,395