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The Type M signal first appeared in 1952. While the Type DT (art decos) were still in production, the Type M provided those who wanted it a more modern looking signal. They were nicknamed "Bread Pans" due to their rounded, pan-like backs.
Reflectors were typically polished aluminum with latch wings. The sections did not have drains and it is not uncommon to see discolored streaks on the backs of the reflectors. Earlier signals used fabric covered wire. Type M signals have been seen with smiley, faint smiley and T3 (beaded but no smiley) lenses.
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