Silver hallmarks have been used in Norway since the sixteenth century. In 1891 a national system was established that is still in use today. The current system requires only a silver standard mark accompanied by a makers mark. The old Norwegian standard of .830 silver purity is still used but beginning about 1920, the .925 silver purity began replacing it and is now the foremost standard used. The letters NM are sometimes seen on flatware, the abbreviation is an indication of a design patent or copyright.

Thorvald Marthinsen Solvvarefabrikk was founded in 1883 in Tonsberg, Norway. The Marthinsen silver goods factory as long been known for tradition and quality merchandise. This lovely preserves spoon, circa 1960's, is a fancy pattern #406. The shell shaped bowl is engraved with an intricate scroll motif, while the gracefully sculptured handle features an open scroll-work and floral design. The spoon measure 5 5/8" in length and is stamped with the Thorvald Marthinsen Hallmarks and '830S'. There are no damages, near mint condition with light patina and lovely pattern.