angore
Collector, Moderator 12 Mar 2018 03:04:27pm | re: Question - Edison 1929 First Lamp - Coil vs Flat Plate vs Rotary
I believe all coil (perfs on 2 sides) versions where Rotary Press. The sheet version was available in both. Rotary press stamps used curved plates so the actual printed image is slightly taller or wide than the flat.
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