Yeah, De Rosas do generally become more intriguing the more you're around them. That's a great catch on the "''75" from ebay on Mookie's site. I'll bet the owner was mistaken - looking at the rear DO's on that bike, they appeared to be longs, but as I look again, they may well be short. I think that definitely puts the bike post-'75, and probably post-'76. I certainly don't think the presence or absence of the heart cutouts is a dating slam-dunk in and of itself. The ebay bike in the OP clearly has the long drops (unless I'm really off-base) and the diamond decal style, which still strikes me as odd.