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Sorry to be rude and direct, but are you trying to ask members of the forum if this fake is good enough to start selling?
Fake or Franken? The caseback seems to be original (for a "no-date").
Can you pls explain why you have come to this conclusion (for learning purposes) … I have compared to the examples shown on omegaseamaster300.com and do not see some conspicuity.
I can recommend to have a look inside the caseback. The pictures are not the best, but should give an idea. I don’t want to be secretive, but not also shout out all the telltales to fakers either. In this case I believe this watch would not be bought based on its caseback alone. 😀