Mastering Engineer known to have worked at Capitol Mastering
Known runout etchings:
used in 1974: JM
used in 1975: J. W
used in 1976: Jay Luck or "𝒥𝒶𝓎 𝐿𝓊𝒸𝓀"
Later on* commonly Jay or JAY was used (written in cursive so may appear as JAM) - please use Jay as ANV.

*Some pressings suggest JAY was used earlier: Red Steagall - April's Paintings / She Worshipped Me