This model came in two executions, strap model (which you have) and bracelet, the bracelet model had an integrated bracelet which attached to the case (specially adapted). Your best bet for a bracelet is to fit an aftermarket one, I can always help with a period Omega if you need a leather band.
I have about 10 articles on various Omega models to upload to wikipedia, including the 1310. It was a real land mark for Omega as it was their first mass produced in house movement. The beta 21 obviously came first but was hugely expensive to manufacture and sell and the 1500 family of watches, again outrageously expensive to develop, manufacture and hugely expensive to buy (by far the most expensive watches in Omegas line up)
The 1310 represented Omegas first foray in to the world of in house relatively high number produced quarts watches and really is extremely well made and reliable. The motors are the most susceptible part of the watch along with the circuits but these are easily sourced and there are masses of variations of model with 1310 which can be picked up (unbelievably) for around £100 so they are a great source of donor parts.
Hope this helps
Cheers Tom
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