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QUOTE The only way I'd buy an M year being newer than an N year is if the model number has a newer year letter (both the model and chassis contained year letters). Zenith would keep building a chassis with the same chassis number for multiple years if it was successful and a product they didn't feel could benefit from more engineering effort....The 14N22 monochrome chassis that ran into the 70s is a good example of that. END QUOTE
Sams coverage was typically 9 mo to 1 yr later. Younger sets were under warranty anyways & if you were factory service you would have an OEM
subscription. Zenith model & chassis ##'s did follow a pattern 95% of the
time. A few examples are
The 14N22 had IIRC a seven yr run, same chassis.
The 25EC58 "flat chassis" was dropped mid year & replaced with the
25EC45 CC2 chassis BUT was used in a few top end combos for F line.
Model ##'s also had a strange mix especially at the high end.
Why was a E4025W 19" CC2 not called a E1925W to reflect the
screen size ?? Later they would, ( 17" = 37, 23" = 45, 25" = 47 IIRC ).
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