I have some baseball just like it - I am pretty certain they are proof cards - but the previous reply might be correct because that looks small compared to mine - would need dimensions to help out ...
Looking for 1970 MLB Photostamps - uncut
Positive Transactions - tennesseebanker, Ahmanfan, Donruss, Colebear, CDsNuts, rbdjr1, Downtown1974, yankeeno7, drewsef, mnolan, mrbud60, msassin, RipublicaninMass, AkbarClone, rustywilly, lsutigers1973, julen23 and nam812, plus many others...
I have two of the Danny Abramowicz cards from the set. They were listed as proofs (One by Columbia City Collectibles/Mike Mosier - I bought it about 10 years ago through an SCD ad, I can't recall where I got the other one). However, they are not rare or 1/1s, and I don't think they are true proofs.
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WTB: 2001 Leaf Rookies & Stars Longevity: Ryan Jensen #/25
Current obsession, all things Topps 1969 - 1972
Looking for 1970 MLB Photostamps
- uncut
Positive Transactions - tennesseebanker, Ahmanfan, Donruss, Colebear, CDsNuts, rbdjr1, Downtown1974, yankeeno7, drewsef, mnolan, mrbud60, msassin, RipublicaninMass, AkbarClone, rustywilly, lsutigers1973, julen23 and nam812, plus many others...
They have the same measurements as regular topps cards (3 1/2 by 2 1/2)
Current obsession, all things Topps 1969 - 1972