Here is another neat one Ted
Lets take Johnny's favourite subsets the Yellow Brown scraps.
These yellow browns are interesting as they have F30 backs but never were intended to be printed with this back. They don't exist. The reason is they were supposed to be overprinted with F42 but never made it that far.
If you look at the series we find several 28 groupings used, one is the example I used called Group1A. Take that group and combine it with the 6 SuperPrints you get 34 cards. 28/28 are found as a yellow brown scrap, no exceptions to any other F30,F25, F42 player out there. Out of the 6 SuperPrints 5 have been found as a yellow brown scrap, missing only Chase Dark Cap.
It makes sense that all sheets using this combination of F30 were used for the F42OP run and one full sheet ended up being scrapped to what we now get as the yellow brown scrap subset.
