What do you mean by ‘old’?
After mid fifties the model reference was engraved inside the caseback. For earlier refrences I refer either to period catalogs /advertising or to Extracts of Archives.
For catalogs I am not aware of any well documented online database, I have constituted my own library, over the years, it became a parallel collection…
All catalogs don’t show factory refrences, some have specific (to retailer? country? who knows now…) refs, others even don’t have refs at all. Some show different refs with the axact same illustration… Like everything when talking about old Omega, it is a mess…
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