Could this be put together from authentic Omega parts? Certainly I think we would agree the dial and bezel are not, as well as the monthly date hand.
In addition to the movement pic, it would be good to see a picture of inside the case back. Case back is not correct for this model as well. The watch you have was first sold in 1985. The case back on the watch would belong on a late 1960s watch. I think others with more experience can comment on the outside of the case back, given all the other issues, I would have reservations if this too is authentic.
Earlier I had not even looked at the case, basically I stopped after looking at the bezel and dial. But the workmanship below is nothing like any of the Speedmasters I own.
View attachment 224828
As far as the bracelet, the 633 end links look suspect as well. The stamping of the "633" looks wrong.
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