Thanks for the comments guys. I believe it is the deluxe chassis, but now know how to confirm once removing the plate over the PCB chroma section.
I believe all three guns on the 21AXP had good cutoff response on Kamakiri's CRT tester. I have not tested myself, but was there when he tested it on Saturday and it looked good. CRT was rebuilt in the 1970s and I believe NEVER used after rebuild.
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-Al
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