Whilst tidying up my Notes on G.C. Dornheim, I realised that I didn’t actually know the introduction date of their
GECADO Tradename (meaning : GEorge CArl DOrnheim),
I couldn’t find a definite reference for it until after WW1 (ie the1924 Catalog). A 1912 ad doesn’t use it and I couldn’t conclusively lower the date searching the internet - be wary that the term GECADO is often used synonymously with the company name “G.C.Dornheim AG” (even it appears before the tradename was established ?). Certainly GECADO was used after WW2 when G.C.Dornheim no longer existed and the Tradename had been purchased by others (Dianawerk-Mayer & Grammelspacher etc).
Remember also that after WW1 in 1924, the tradename SELKADO was used for the firm of Selve-Kronbiegel-Dornheim (SKD ) when it was established incorporating Braun & Bloem (Selve), Dreyse & Collenbusch (Kronbiegel) and the ex-Stahl factory (Dornheim) which was closed. G.C.Dornheim still existed separately after that date until WW2 and used GECADO.
Maybe someone with great references, catalogs etc (Fede ?) can pin this date down more accurately ??