Spencer Company Eye Test Chart on Board color theory puzzle I have searched but not

I have searched but not found anything about John

but I think such a winning one

5" openings

The graphics on the backs are fun

and went on to set up a workshop in Jerusalem

Spencer Company Eye Test Chart on Board color theory puzzle I have searched but notI believe this eye test chart dates to the mid to late 1940s; I have found some references to the Spencer Company of Mount Vernon that produced it from around then, including in Popular Photography magazine advertising photography equipment. I have found no matches for it out there anywhere though, so am not sure how much traction it gained as among optometrists though with its terrific mix of text and patterns and color it seems like it would have