Quote:
Originally Posted by dieseljeep
The original ones were the "M" models.
The last run, 1957, were the "Q" models. They still didn't hang on as long as the "Porta-Colors". 
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The Portacolors, 14N22 Zeniths, RCA 630 and clones, and CTC-15/16 and clones are in a league of their own in terms of production longevity...Seemed those designs all got around a decade of production.