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I believe the bracelet and end link reference is 1574 / 898.
The 898 end links are “restricted” at Cousins.
However, the Railmaster has been fitted with different optional bracelets over the years. I would see if maybe a common 1171 strap would fit. I paid around £200 for mine. It’s the standard Speedmaster and Seamaster 300 bracelet; you just need the correct end links for your particular case which can be a faff to try and discover.
You could buy the correct end links and then fit a generic strap if the Omega ones are too pricey.