[ohohyodafarted]

The early dark green screens on the early production 21axp22 crt's are believed to be of the same full gamut formulation phosphors as the 15gp22 used in the ct100.

I have 2 sets with this dark green phosphor 21axp22. I have one in my 21ct55 and also one in my ctc4 Haviland.

Sometime during the production of the ctc4, (or perhaps at the beginning of the ctc5 production) the phosphor formulation was changed to that which is common in the later tubes with the light gray screen.

The early production 21axp22 has vivid Blue and Green phosphors. I love to watch The Wizard of Oz with the saturation control cranked up. The colors are very vivid.