Hello Mikee, execution seems somehow crude to me. But the stamping says "apprenticeship workshop" (of the city Wuppertal) therefore it could be a workpiece on which the apprentices did learn how to handle certain tools. There were funny things (see my letter opener of a flyer´s technical school and the proper, period postcard) and it is easily possible that your letter opener was made during 33-45, but we will never know for sure until any period documentations (like eg. a postcard or another photographic documentation) does surface.
Regards,

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wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.