I’m not sure just what these were really about when they were made, but given the logo, it seems likely it was some advertising stunt. Yeah, “3-D” glasses by red and blue film for each eye. Such things have the advantage of simplicity and thus low cost, but the disadvantage of screwing up the colors – even black and white can seem off. And there is the issue of which eyes gets which color? The L and R labeling here was written on by someone, not printed during manufacture.
Every once in a while I do find some stereoscopic image that uses the color separation scheme. That is why I (still) have this gimmick. The use of color for this does mean that images can be on a computer screen, or on paper, and work. There are better, fancier, and therefore more expensive stereoscopic systems that do not have that ability.