From 1974 - 1978 I mailed out over 25 price lists of major mint errors. My all time favorite was my first catalog which was photographed, printed and distributed in 1975 by John Devine (Lonesome John) from Newbury Park, CA. It was a 26 page catalog containing the finest major mint errors with photographs, descriptions and prices.
One example is a 1900 Indian Head Cent struck in gold that I purchased from the Beck Collection in 1974 for $7,750. Today, this mint error would easily bring $75,000!