Yeah, one of the things that has kept me away from actively collecting the home run cards (in addition to the price of some) is the difficulty of identifying the card and set without the back to go on.
PSA has a pretty spotty track record with identifying vintage Calbee cards even with easier sets, (this is my favorite:
http://japanesebaseballcards.blogspo...ded-cards.html ), I can only imagine what they would do with home run cards!