The Geha company was founded in 1918's by the two brothers 

Heinrich and Conrad Hartmann. 

A contraction of this name "Gebrüder Hartmann" gave rise to the trademark "GeHa" 

which became the official title of the firm. 

Geha started to produce fountain pens in the 1950's and invented

 the "ink reserve tank": a tube filled with ink which

 could be released when the main ink reservoir 

was empty by pressing a small pin under the feed. 

In the 1970's Geha Schoolpens, together with those of Pelikan, 

were the most popular pens in Germany. 

The firm was taken over by Pelikan in 1989's.

Manufacturer from Hannover Approx. circa 1979's.

Specifications:

-Colour: blue

-Cap imprint: Geha 

- Nib imprint: Geha

-Nib material: steel