Very early Ednalite Polarizer. I believe this was intended for use in a rangefinder, though I don't know which model. Seems to be an odd diameter...maybe 53 or 54mm? The box, data sheet and viewer are all in very good condition, and the Polarizer itself has lost its color around the perimeter and in the center. May work and may turn out fun-house images. Maybe you could replace the Polarizer glass with one from another filter however.
$2 plus postage

Also offered is a Kodak Instamatic Reflex step up (or step down depending on your perspective) ring going from male 29.5mm to female 52mm. $3 plus postage.

PayPal ok for international, check/cash/money order inside the USA please.

Jon