Although this one is not officially marked "Chronometer" on its dial, the caliber 70.3 inside is personally considered a historic work from VEB GUB! According to a GUB Caliber 70.3 brochure displayed in the book "Wristwatch Chronometers" by Fritz von Osterhausen," there is something interesting....
"The Top-Grade Glashutte Quality Watch and the Glashutte Chronometer-Model Wristwatch,
Caliber 70.3, are prominent members of our family of high class products which have been awarded the highest official designation of quality "Q." The use of only the very best raw materials, the careful processing, the conscientious construction and the strict application of electronic inspection and testing represent the foundation for the superior value of these watches."
Historically interesting, isn't it?
Regards,
Joe