The Komic Kamera
Judging by the images on the unit itself, it was mostly used to present comic strips. (The back side features Krazy Kat, Dagwood Bumstead and others poorly drawn versions of comic strips characters popular around that time.) The only strip example I've seen featuring illustrations; I'm guessing the black and white linework was cheaper to produce in this format than photos and/or color? But as near as I can tell, you could swap the film strips out almost as readily as you could a ViewMaster reel, so even though I've only seen the one, I'm sure there would have been others available.
Now, here's the interesting bit. The one strip that I've seen is currently up for auction on eBay here. Here's the title image...
The steroescope was around long before ViewMaster came into being -- the earliest ones date back to the 1830s! But ViewMasters' big revolution was in using them to present stories instead of just scenic images. I argued back here that this made those reels comics. But evidently, ViewMaster wasn't the company to come up with the idea in the first place. This Russakov Can Company was doing comics and comics porn decades before!
And what I find really amazing is that these ever existed. Compared to a Tiajuana Bible, these must have been incredibly highly priced just to cover the basic costs. I was always under the impression that smut from that era was produced as cheaply as possible because it was all under the table. Evidently, though, there were several socio-economic levels in that particular black market!