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from what I've read it's a type 1 bezel and D3 (not D5) dial
but it's not clear that this configuration is inconsistentwhich is consistent to my understanding.Can't comment on the movement as you haven't posted that info!
This is worth a read https://omegaforums.net/threads/vintage-ploprof-600-roll-call.19277/
Edit: These are tool watches which often had hard lives, so it's to be expected that parts get replaced at service. Back in the days watch collectors didn't value provenance over condition as they do now (it's actually quite a new phenomenon) and it wasn't unusual for a watch repairer to replace parts more liberally than they might do today.
Also, there are rumors particularly of a bunch of ploprofs being unsold in the 70s when Omega almost went bust, and disassembled for parts. So provenance for any Omega from 73/4 onwards is a bit more complicated.
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freddo
I've been doing more Ploprof research. The movement is too early - it's of a series that were never put into the Ploprof at manufacture, so it's been swapped in likely at a service.
The case is a mark 1, as is the bezel, but the dial is from the mark 2 period. That said, it's one of the rarer dials - never officially produced, but found in sufficient numbers to be given a specific identity (D5, Ploprof fans).
It's not a service-part lashup, it's largely a Mark 1, but I won't (obv's) pay for a numbers-matching watch when it's not.