What time is it? Watches and horology

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).

D3 black, which according to the author of the Omega Ploprof site is Mark 2 period.

I can't see that the D3 is a Mk2 only dial on omegaploprof.com - can you point me to where this information is? The watch you've posted seems to be entirely consistent with the Mark 1 design, all parts are mark 1 including the dial.
Here's a couple of Mk1 examples from well respected collectors:
https://omegaforums.net/threads/vintage-ploprof-600-roll-call.19277/#post-209759
https://omegaforums.net/threads/vintage-ploprof-600-roll-call.19277/#post-209774

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.

What is the movement in the watch?