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He's making a very contentious statement and many people would disagree. This is the nature of vintage collecting, there is only consensus, not absolute truth. For example, I posted several examples of D3 dials on 1 style cases with B1 bezels above, held by other respected collectors who consider these as complete Mk1 watches. Anyway, I don't care much to disagree with your conclusion, just be aware that there are fewer experts than claimed experts in the field of vintage watches.
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290XXXXX 1002 - too early for the watch, again according to the author of the Ploprof site.
29,000,000 serial number is correct for 1970 manufacture (1971 sale) according to
Sheldon BrownChuck Maddox.
http://chronomaddox.com/omega_serial_numbers.html
Which is consistent with a Mk1 Ploprof...
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
What is the movement in the watch?