This oldtimer has seen the 1916 two-feather nickels as well as many other dates; particularly those from the Philadelphia mint. I recall some years ago that there was a dealer who set up at a Cleveland show on a regular basis. He had a number of various two-feather dates in his case, but they never seemed to sell at the premium prices he sought.
I concur with mycrob's post. Personally, I think that the 1937-D three-legger is an over-rated rarity. I see many of them in dealer cases at shows. There are probably far less two-feather 1916's around than those ... but, not enough of those 1916's to warrant an album hole! Holes = $$$