That's ok, its a Speedmaster Pro, so any Speedmaster bracelet will fit it, there's a brief rundown on those bracelets here:
http://www.omega-addict.com/reviews/bracelets/
Then there's part two:
http://www.omega-addict.com/reviews/bracelets/article2.html
The best option on balance is probably the 1171/633
So you need to get a bracelet model OME-1171-000 and then a set of end-links model OME-026ST633, which is around $300. The bracelet has the same vintage look as your original, the same taper, is quite light, very flexible, and rather strong, should give you a few decades of honest service.
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