Translated:
"Engineer Landstads "automatic revolver" from 1900, manufactured at "Hovedarsenalet" (Main Arsenal). Only a few shots were fired during trials, and the revolver must be considered a total failure. The revolver was, however, one of the first Norwegian constructions ever to be tested in anticipation of a future adoption of a semiautomatic sidearm for Norwegian military/police issue (the text isn't clear on which, it says "service firearm"). The revolver is preserved in England (dr. Geoffrey Sturgess collection and photo)