I don't have a lot of information to share on this piece. This may be of German origin. Apparently the incuse markings on this are not well known. On the top of one ear is a circle with a capital "M" inside of it. Centered between the legs of the "M" (and lower) is a smaller sized "P". To the right of and below that marking are additional numbers, perhaps some sort of date code. I can furnish additional pictures on request. This is in pretty much flawless condition. If not for a few small stains on the underside base, I think that one could believe that it was unused. Though not an uncommon style, due to the unusual markings, I am asking $20.00 plus shipping. Thanks