Matrix A: DF-363-526 Δ 47201 Matrix B: DF-363-527 Δ 47201-X (etched)
Pressing Plant: Monarch Records Mfg. Co., Los Angeles, California.
Probably a plain sleeve.
Label images from Bengofury.
Frank Zappa’s involvement
Frank Zappa wrote both tracks and played lead guitar, rhythm guitar, drums and percussion on “How’s Your Bird” and lead guitar, rhythm guitar and backing vocals on “The World’s Greatest Sinner”