Quote:
Originally Posted by dieseljeep
I have never seen a metal cone crt, that was aluminized.
The "C" probably only designates an improved or latest version. 
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I've never seen an aluminzed one either, but the Tung Sol data sheet does say
19AP4C - Grey Filter Faceplate Aluminized Screen
http://frank.pocnet.net/sheets/127/1/19AP4.pdf