[Ron Ramirez]

The 80 Jr. (which includes the 80B cathedral, 80C table model and 80P portable) was introduced in the Fall of 1932. Around the same time, Philco began to modify their 51/52 Colonial Clock cabinets to accept model 80 chassis. I have an 80 Colonial Clock. Anyway, it appears the 80C, 80P and 80 Colonial Clock were not high-production items, and were off the market by May 1933 if not before.

From my research, it appears the the 81B was introduced around January 1933. Both the 80B and 81B remained on the market until January 1934, when both the 80 and 81 were discontinued and replaced by the then-all-new 84B.