Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus without a chipped or cracked

without a chipped or cracked block that I can see

The scalene triangle is marked with a Sphynx logo

and I rather like the effect of these surface imperfections subtly undermining the perfection of beauty herself

Plus gold paint on the lower halves of each of the three interlocking locks

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Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. pretty abacus without a chipped or crackedFound 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: