1931 Wilhelm Weltersbach catalog from the HUBERTUS products site.
I believe the old knives probably have the PUMP logo and the later post war models have WILH. WELTERSBACH over SOLINGEN-GERMANY or WEIDMANNSHEIL over SOLINGEN over GERMANY.
Note the top knife has the large 26 cm blade.
Last edited by C. Wetzel-20609; 08/20/2023 08:32 PM. Reason: added more information.