I am usually on the sports side of Net54 but the folks over there said that I should post the overprint question on the Non-sports side for identification.
I recently purchased a T206 Elberfeld Washington Port. off of ebay and from the small photo I thought that the card had some glue or paper gain on the bachttp://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rt=nc&nma=true&item=380306631450&si=%252BXhvE0Cl4mTMVFeae7l5uOBGAeg%253D&viewitem=&sspagename=STRK%3AMEWNX%3AIT
I received the card in the mail today and to my suprise the markings on the back are an overprint of an airship. I used some photoshop magic to take out most of the piedmont printing to get a better look at the image. If anyone has any comments as to how this could end up on the back of a t206 baseball card or they know what series this is from please feel free to contact me or post below.
I have larger scans on page 2 of thrhttp://www.net54baseball.com/showthread.php?t=132503