Mahdi
·Yes, possibly some movement parts have been swapped and the serial # of the movement doesn't indicate the age of the rest of the watch.
This watch from the late 1940s has a similar design:
http://www.chronomaster.co.uk/watches/classic/omega-automatic-bumper-movement/ome-613/
(No reference provided there.)
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I found this one - see link
https://hobarttown.com/product/omega-original-1940s-bumper-auto-from-ww2-period/
Wonder if there is something wrong there - price seems a bit of, is there something special about this watch.