Apparently an adaptation of Milton Glaser’s Baby Fat Black.
“Robert Trogman originally designed Buxom for Fotostar in 1975 with lettering from Herman Spinadel.” — MyFonts
“Another Facsimile Font original produced in the offices of FotoStar International. The lettering artist was Herman Spinadel a retired New York designer. His work also appears in the Photo Lettering, Inc. catalog.” — Robert Trogman
Shown in the 5th revised edition (1976) of Lettera 2 with a Headliners credit and a “ca. 1970” date.