I got my grubby paws on it today. Methinks i've searched and inquired here already, but now i can describe it more accurately. and even a pic later maybe if i'm lucky, but lens is fouled.

It's about an 8x2x1 hunk of wood with a barber hone fixed on one side and a felt-backed strop buttoned from the stone side-around the ends and across the entire backside. Hollowed such that a razor, maybe two can be stored inside the whole thing. I thinks it's dabomb, but can't find any ref to it out there on the webading.

Official name, one sticker still intact: "20th Century Razor Strop" also "Keeps the Razor Right". Pat pend. plus normal AH markings. I'm going to clean it up gently. Stone appears to be removable, but i don't want to risk the label. Original box indicates that it was sold for 2.00 at some point in time.