[a] In 1962, Spector purchased Sill's stock to become sole owner at 21 years of age, America's youngest label chief at the time.
"Harry and Milt" and many other flipsides were deliberately undistinguished instrumentals, which were intended to focus attention on the A-sides.
Also, most discographies, including the one in the Back to Mono booklet, list two items with catalogue number Philles 123.
"Stumble And Fall" by Darlene Love was released and then withdrawn (both stock and promos exist) in August 1964 (according to Billboard magazine).
After the chart failures of the last few singles, Phil Spector stopped producing and releasing new records on Philles.
In the summer of 1966, he signed Bob Crewe and Jeff Barry to produce The Ronettes and Ike & Tina Turner.