Hardest to Find Topps Card?

[JollyElm]

I was talking about variations with someone today when they mentioned how tough it is to find the 1967 Topps Ed Spiezio card (that I have in my errors & variations thread) with part of his name missing. That's definitely a near impossible card to find in any shape.

So, it doesn't have to be a variation per se, but what card or cards do you think are the toughest to find from Topps during the years 1957 to 1973?? Just Topps.

Let's lay some groundwork. I'm not talking about things like proofs. For instance, the 1967 Maris on the Yankees blank backed card or the trio of 1960 cards found with different teams on front. Those do not count. And I'm not specifically talking about the price of the card. For instance, someone might point to the 1969 white letter Mantle as being extremely hard to find, but in all honesty, there are plenty of them out there. They just cost a lot. I'm talking about cards that were part of the wide Topps distribution, but for whatever reason--being a variation or a SP or whatever--they are just ridiculously hard for you, personally, to find these days.

I will start by nominating the 1973 Al Kaline with a band aid on his forehead and the 1968 white letter #400 McCormick card.