How common (or uncommon) were 24" B&Ws?

[Robert Grant]

Often looking at old TV sets wherever they may be seen, I've noticed for a long time that among the B&W sets of the mid-to-late 1950's, 21" sets greatly outnumber 24" sets.

Recently, I've had a chance to acquire old retail catalogs as well as magazines with ads, and I can see the reason why. Before the more rectangular CRTs with the bonded faceplates came in the early 1960's, 24" sets were more expensive that 21"s, almost twice as much, in some cases, and (after late 1956 of so) some 24s were almost expensive as a 21" color TV (e.g. CTC-5 "special" Aldrich).

Any idea just how many 24" B&W sets were produced?

Rob, Michigan, USA