1970s written all over it. Can find a few that are similar but all seem to be the same incabloc Valjous 7733 movement. Can he get the back off and see whats engraved on the movement. I’ve read the name as Rhudus?
I would be hazarding a guess that many watch makers just branded the same basic designs and sold them as cheaper copies of the bigger brands. Styling cues from Heuer and others, such as