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[quote]Were the GSA holders the first slabs?
Brown box Ikes came in the same type holder starting in 1971. Also in the mid/late 60's the special mint sets came in an acrylic or plastic type holder.
I do consider them to be the first slabs. The proof silver Ikes predate them by a year, but those coins are not graded they are just Proof. The GSA coins were separated into CC coins and non-CC coins and then each of those was was further subdivided into circulated and Uncirculated and there was a different type of holder for each one so the holder type tells you what type it was and a very rough "grade"
The 1966 and 1967 Special mint set holders don't qualify because they don't grade, and they are not sealed. The sealed 1968 and on proof sets do not qualify for the same reason as the silver Ikes didn't. No grading just proof. And remember proof is not a grade, it is a method of manufacture.