Title: Cal. 265 with 36-million-range Serial - Service Bridge or Factory Oddity?

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Good morning
I have a 9 ct gold Omega hallmarked 1952 with a Cal. 265 movement. Everything looks period-correct, but the serial is in the 36-million range, which would normally date to the early 1970s.

The engraving appears factory-done, though the balance bridge has a slightly redder tone than the rest of the movement. Could this be a later Omega service-replacement bridge carrying a newer serial range?

Has anyone seen similar late-numbered 26x-series examples or know how Omega handled replacement bridges in the 1970s?

Many thanks