Question about boxing Exhibits

[camaro69]

I have a few boxing exhibits as can be seen in my trade thread(link below). But I I have no idea why there appears to be 3 different color back grounds.There are some that are white,some that at are grey and then some that are sort of a green background. Does it have anything to do with different years? Or something that I had heard from another collector that the green backgrounds were issued in Canada. Any help would be appreciated. Thanks,

http://www.net54baseball.com/showthread.php?t=243517

[sthoemke]

They were produced over multiple years.

The sepia-green cards are the scarcest.

[Exhibitman]

For post-1928 cards the best determinant of scarcity is series. The early 1930s are the rarest by far. Your stuff is not that old. None are particularly tough. Some nice HOFers there, just easy to find.

[camaro69]

Thanks a lot for the information.I always figured they were not very scarce. I am never lucky enough to find anything too rare.Thanks again for the help.