The device itself hails from 1939. I do not know the date of the ad. 50s? 60s? Probably no earlier than 60’s per deduction from everett@lemmy.ml below.
It seems like the projector version, you would lose the 3D, wouldn’t you? Which is the whole point of a Viewmaster, for my money!
I like this ad style too.
I never even knew there was a projector, until I saw this very ad!
But whatever year it was, $11 got you the projector, the normal viewer, and 15 reels!