Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. name tags though I'm quite partial to

though I'm quite partial to anything Egyptian themed

) Nicely graphic in red

with exuberantly painted decoration for head band and huge earrings in the middle

I'd guess 1940s-50s c

but completely blank back

Snellen Vision Testing Cards Set for Railway, Marine and School Exams, Early 20th C. name tags though I'm quite partial toFound 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: