There were leftover 1039s still being used on 145.022-71s. The last dated 1039s were either 4/71 or 1/72 AFAIK, but there are undated ones that were produced a bit longer. For a watch in your serial number range this isn't uncommon
https://omegaforums.net/threads/nee...edmaster-105-012-66.78463/page-3#post-1011633
There are many Extracts that mention bracelets, and always by reference number (not just by material as you suggest). It depends on whether the watch was paired with the bracelet at the factory, which would have been included in the production notes that are used for the Extract information.
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