It's not a 7928 they had a 390 movement.
The dial type you have was used on the 7598 and 7528
The movement looks like a 2843 and should be hacking
The early Tudors where date stamped below the model #
Check the serial and model numbers between the lugs
cubias a seller on e-bay sells a lot of franken watches
The one you have may be a culmination of genuine parts or totally the real thing
In any event it looks.............