Szia,

Ha minden igaz ez lesz a válasz a kérdésedre:

The KJ is the casemaker Kollmar & Jourdan AG Kollmar & Jourdan AG.

Google translate:

The Kollmar & Jourdan AG was founded in 1898 as "Kollmar & Jourdan AG Uhrkettenfabrik" and manufactured watch chains, watch cases, watch straps and jewelery in Gold, Silver and Gold Filled. The company was in the Bleichstr. 81 (Watch this site) located in Pforzheim and operate branches in Grötzingen, Boxberg and Neckarbischofsheim. It concluded 1929/1930 due to the impact of the global economic crisis. In the Pforzheimer disaster of 23 February 1945 destroyed about 85% of the company substance. 1952/1953 the company announced that the reconstruction is almost complete. 1977 was followed by the port bankruptcy.