I used to have quite the collection of analogue drum machines, modules, and the like. What I have found is that there were a lot of low production machines that are so rare that nobody knew about them. They may have appeared once in a drum magazine and even got a review. Then there were either production problems and of course people who had a bias against them. CBS should have been able to get them distributed well enough, so I suspect there were a fair amount of production problems.
What you have is one of those beasts that are so rare that nobody even saw one before. It was probably the only one that the store EVER had on the floor!!! And yet for some reason, none of the studios bought one. I had a few of those types of e-drums and modules, as well as the better known ones (Simmons, Pearl, Tama, Linndrum, Roland, amongst others). The funniest thing is that unless you're looking at a Drum Kat, the triggers have the same anatomy from day one: a piezo transducer takes the pressure or sound and fires the white noise generated to trigger the sound.
Does it have individual outs or just mono or stereo?
I also suspect that it's probably more likely from the mid '70s. Have you checked on synthmuseum.com?