21axp22a tube

[aerials]

Looking in my Allied Radio catalog 1961. I found the 21apx22a "silverama' tube for $137.20 and the "red label" 21apx22 no "a" for $98.40 also the 21cyp22a for $137.20 as well. No listing for the color 15 inch tube . Too bad someone did not stockpile any of these rare boxed tubes.