The Morkrum Company Model GPE Perforator was designed about 1913 and continued to be produced for the next 50 years, a corporate record. It was magnet driven, and was very fast, being a "work horse" during two World Wars and the intervening Expansion and Depression eras. [5] GPE was for Green Code Perforator, but it was also called the "Iron-Horse" Perforator. The Green Code name came about for Western Union equipment, which used an olive-drab green color.

The GPE was produced from 1913 to 1925 under the Morkrum Company, from 1925 to 1929 under Morkrum-Kleinschmidt, and from 1929 to 1963 under Teletype Corp. However, the GPE may have carried a "Teletype" nameplate and the scroll symbol as early as 1921.

(need more poop here)....

Model GPE "Iron-Horse" Perforator
	Standard Model: GPE Military Model: ?? Design Relative: None Manufactured: 1915-19?? Units Produced: ?? Units Remaining: ?? (estimated) Dimensions (inches): ?? Weight (pounds): ?? Keyboard: 3-row with spring-cushioned green keycaps on later versions, or non-cushioned gray? keycaps on early versions Code: 5-level baudot Interface: None Motors: 110-VAC Synchronous Options: ??

This later-model GPE used the cushioned green keyboard, and had a sound-dampened cover.
This guy is in great condition.
The machine has no motor -- solenoid magnets power the tape punching.
More mechanics than circuitry. This would be the case for Teletype machines until the Model 32, which included a fair bit of electronics.
These GPE units look to be an earlier production -- or are they just dirtier?
This one looks much earlier -- the keycaps are different, and there is no large button on the right. The logo plate likely is Morkrum Company or Morkrun-Kleinschmidt.