Hi Kasper,
Speaking about watch industry, in the 60's-70's Geka was a watch brand of Geka-Werke Offenbach/Dr. Gottlieb Krebs company from Germany - a company involved mainly in photo-camera business.
It's a quite similar situation as in the MBO watches business, produced for/sold by German company MBO - mainly a seller of digital calculators and computers.
And I agree with bonki46, the module is the same from some midle-late 70's Yema's LCD ( e.g Yema 910 - a watch that it seems You have one in Your outstanding collection and shown to us in another thread :)
viewtopic.php?f=67&t=8079Below one may see another example of Yema 910, with the same module as Your Geka:
yem_br_module.jpg
Best regards,
You do not have the required permissions to view the files attached to this post.