Delcona is a trademark of Helma-Uhrenfabrik, Linde & Co. / Burkhardt & Cie. Registered on September 22, 1932. in Pforzheim. It was used for wall clocks, pocket watches and until the 1960s for men's and women's wristwatches. Swiss movements were built into the wristwatches.
Source:
https://watch-wiki.org/index.php?title=DelconaClick to expand...