Cameo and Deep Cameo Proof Lincoln Wheats from the 1950's...Uncommon?

My research indicates that cameo or deep cameo Lincon Proofs from the 50's are uncommon and in some cases rare. Non-Cameo proofs, on the other hand, are common.
Why are there so few cameo and deep cameo Lincoln Proof's from the 50's?
Also, what are the technical requirements for a proof to be designated cameo or deep cameo? I always thought that is was a subjective judgement based upon the look of the coin. Evidently there are objective technical elements involved like frosting, no?
Why are there so few cameo and deep cameo Lincoln Proof's from the 50's?
Also, what are the technical requirements for a proof to be designated cameo or deep cameo? I always thought that is was a subjective judgement based upon the look of the coin. Evidently there are objective technical elements involved like frosting, no?



Collector of Early 20th Century U.S. Coinage.
ANA Member R-3147111
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Russ, NCNE
“In matters of style, swim with the current; in matters of principle, stand like a rock." - Thomas Jefferson
My digital cameo album 1950-64 Cameos - take a look!
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Treasury Seals Type Set