Ron Gratz , Oct 10, 2004; 12:51 p.m.
What you have is an Ernemann Heag, probably the Heag I. Zeiss-Ikon formed by the merger of several companies, including Ernemann, in 1926. Before the merger Ernemann marketed a wide variety of Heags (Mckeowns lists Heags 0 through XVI) including stereo models. After the merger Zeiss-Ikon discontinued the Heags but did sell the left over stock with the Zeiss-Ikon logo on it. I own a few of these. From the photo it appears that your example does not have rack focussing which would make it one of the simpler models and the photo looks like the Heag I in Mckeowns book.