Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus With a wonderful little bow

With a wonderful little bow tie at his neck and stain at upper left seems like a lucky cloud

with glossy front

6 1/2" long x 4 1/2 tall

A few small edge chips here and there and a little a little greening to the brass pins

The scalene triangle is marked with a Sphynx logo

Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus With a wonderful little bowFound in their original envelop, with Millar and Wel_ (?) Opticians on, Boston stickeron the face and instruction card still inside, this appears to be a complete, or nearly so, set of early 20th c. Snellen vision testing cards. Nineteen cards total, plus instruction card, with three of the cards showing railway signals to be read at a distance of 20 feet as these were commonly used for testing the vision of train conductors railway workers. Included: