@atlantadrumguy: The reason 24" Los Angeles-era Camco’s are more common than Oaklawn (Illinois) and Canute (Kansas)-era 24’s is that LA-era drumsets were made in the 1970’s, when 24’s were coming into favour by Rock drummers like Mitch Mitchell, Carmine Appice, John Bonham (on the first USA tour; he shortly thereafter played 26’s exclusively), Johnny Barbata (a fabulous drummer. The Turtles, CSN & Y, Jefferson Airplane and Starship, L.A. studios), and Dino Danelli (The Young Rascals).
24" kick drums had been favoured by Big Band drummers for years, players like Buddy Rich and Louie Bellson. I don’t think it’s a coincidence that the Rock drummers who started playing 24’s were all very Jazz-influenced. By the way, Buddy particularly liked the playing of Barbata, following his career. Give a listen to his playing on The Turtles "Elenore", "Happy Together", and "She’d Rather Be With Me". Fantastic! Buddy also approved of the playing of Bobby Colomby (early-Blood, Sweat, & Tears).
By the way, my AudiogoN handle includes "24" in honor of my love of that size bass drum. Drummers (at least those with knowledge of vintage drums) will know what "bdp" is used in honor of.