I picked up a twinplex stropper a few weeks/months back. It is in great shape but it don't sharpen worth a damn. i'm glad i bought it cause i think it's a neat item. Is there any way to tell how old it is?
They were made over a period of decades; from about WWI into the late '40s. I think TwinPlex is still in business, but their blade stroppers are a part of history.
Keep in mind that they are not sharpeners, they strop only.