From Germany comes this attractively styled half-track mono machine.  Tape speeds were 3¾ and 1 ips with a maximum reel size of six inches (15cm).  Features included a three digit tape counter, an electro-magnetic automatic stop at both ends of the tape, tone and volume controls and a five-watt output (of dubious quality - see test report below).. 

The machine had a remote control foot-switch (like most German models of the day it encouraged its owners to use it "für das diktation!")

The model 404 was identical to the 403 but was a quarter-track mono unit and sold for £10 more.

Movie Trivia:
In the 2002 submarine flick "K-19, the Widowmaker", it's 1961, and at the height of the Cold War, Captain Vostrikov (Harrison Ford) retires to his cabin on board the ill-fated Russian submarine 'K-19' to chill out to some classical music using one of these recorders.

There is a vintage test report and additional images for this recorder on the CD-ROM