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Help in identifying silver fineness in a Swedish silver spoon

Dear All! I have a little issue in identifying the purity of silver on the object below. What I managed too find out is that this spoon was made in 1907 in Jönköping (mark “J”), Sweden. Z&S mark is probably the producer. Three crowns mark in a trefoil is the National control mark since 1901. The “swan” mark means that it was imported in France (that’s where I bought it). The only thing that embarrasses me is that there is no a fineness mark. Is it OK in this case? Please help! Thanks!