[AustinMike]

Hey Chris, we've discussed Mantle collecting before, so I think you know where I stand as far as a "complete" collection goes. In regard to your question, I'd say if you aren't sure there is a variation out there and have seen no proof that there is, I think your collection is complete. However, should you get definitive proof that the variation you think might exist actually does exist and you want it, then your collection is not complete.

And to follow up and what Larry wrote in regards to Mantle collecting,

1 1952...I'll go with that I disagree. I think both are needed. (full disclosure, I have neither)
1 1959 Venezuelan....I'll go with that I disagree. I think both are needed. (full disclosure, I have one)
1 pittsburgh? Cant go with that..2 different cards I agree (I have neither)
Do u have?
Dads cookies? A must I agree (Thanks to Fred, I have it)
Yamakatsu? Not a must I agree
Japanese bromide? Not a must I agree
3 different auravisions? A must I agree
5 different HI matchbooks? A must I agree
64 sports heroes sticker? A must I agree
Opc tattoo 1960? A must I agree
1965 Bancroft Tiddlers Not a must (Butt ugly cards)

So yeah, there are difference of opinions on what constitutes a complete set.