New Variation

Got wind of a new variation I didn't know of in the 1968 Atlantic Oil set evidently there is total of 4 combinations of fronts to backs.  They come with 2 different backs  - game rules and play ball which most of us know but also on the front the name comes in either solid black font or a half tone gray font.  Also the grey tone ones seem to have a sharper picture and deeper blue border.  Pretty obvious when you see them but never noticed before today.  Neither seem any scarcer than the other so no great premium just another couple cards to chase down.