It seems to be an oil painted etching mounted to wood with some.sort of stamp on the reverse and some.writing and a number. Curious as if to anyone has any ideas what it is or was used for. Interesting work.
Thanks for that info. I did a little research into that which seems it was a process for allowing export of historical items in Germany and Austria. I am thinking maybe this was a Religious Icon. I have been unable to find the original engraving online. Was dirty, but cleaned up well.