From the tiny picture you've provided it looks like it's a ref 1479 bracelet, shouldn't be that hard to get. It's not as desirable as the ref 1450 with good reason, I'm told. Other suggestions - look into 1498/1499, they have the taper that modern refs don't.
Gym watch? Not sure if ST1 is the best choice for that but I guess check out omega's rubber straps.
@yinzerniner is the expert on OEM pairings. He had a ST1 pairing with rubber that I was impressed by!
Click to expand...