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4 13/16" w x 2 9/16" d x 1" t and in excellent condition
which I think I'd frame just as shown
6 1/2" l x 3" widest diameter
Another very unusual one
The house is made of crate wood
Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. h sloan carrvinh 4 13/16" w x 2Found 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:
