You have me at a disadvantage now, as I'm looking on the iPhone, and your images are not really grade-friendly! What I would say, though, which is important for the variety-point you raise, is that, regardless of the overall grade of either of the coins, there is definitely wear or weak-strike in the region of the date on the coin with the 'broad-numeral' date, which can be clearly seen in the waves of your earlier posted images!In all honesty, if you are looking for hitherto undiscovered varieties of the 20thC period, you will need to be looking at the macro level, on coins in extremely high grade, to find them, and especially if you want to get them acknowledged by the numismatic establishments. You spoke of Dave Groom & Chris's books, I'm guessing you know Chris is the host of this site, and that Dave is a regular visitor/member, maybe he could take a look and encourage you in your search. It's great that you are so enthusiastic, all the best discussions on here generally start this way. Keep it coming!