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The 25NC37 indeed uses the 6BK4 and a 6C4 pincushion correction. It also has a 19EYP22 crt. That's also a flipper chassis as they put the HOT and the HV reg in that PITA spot behind the HV cage. Very similar to the more common '67 20X1C38 chassis except the 20X1C38 combined the PC correction into 1/2 of a 6KT8 which also serves as the color amp and the 6BK4 gets replaced by the 6HS5 pulse regulator. Same chassis footprint and general tube layout though.
Never did discover any documents with production figures for Zenith. I've had better luck acquiring leftovers from Motorola employees than I ever did with Zenith.
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