The server was probably made in 18th century based on its design and decoration. The handle is connected to the blade via a rattail. There are several hallmarks that are hard to decipher. One is Nathanses for a maker. The server is probably Swedish or Finnish. Condition is very good. There is a small crack or dent (see image), and some small scratches, otherwise no damages. Length: 11 3/8 inches, width: 2 7/8 inches, weight: 2.8 oz.
Very old solid silver fish server, probably Scandinavian