A little bit more.
Hroar Prydz was not a silversmith. First he was a salesman by H.C.Ã˜strem in Oslo (from 1877), and then he started as a merchant in 1891. He had small workshops working for him. Later on he started his own workshop with thimbles, pockerknives, napking rings, bookmarks etc., and a small part of enamel jewellery.
Hans Myhre (he was not a silversmith) bought in 1838 and then as you say the firm growe large in enamel jewellery and spoons.
Look too www.solvstempler.no