[quinnsryche]

Hi all. I have a question if someone knows the answer. I have a small stack of baseball exhibit cards and they all have a grey background as shown in the photo. The white around it is for comparison sake. Does anyone know when these were produced or by whom? These are all mint and all stars like Mantle, Mays, Aaron etc. If they were original I could retire but know they aer not.
Any help would be greatly appreciated and inquiries to sell also welcome.
Thanks in advance,
Tony