Apparently an adaptation of Milton Glaser’s Baby Fat Black, designed in 1964 and sold by Photo-Lettering.
“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 Berthold’s E3 catalog with a Facsimile Fonts credit.