Here are more examples of the Herring Serving Fork that is found in few patterns, most by Georg Jensen. This makes sense since Jensen is a Norwegian Company and Herring is a very popular dish in that country.
Acorn by Georg Jensen (with black horn) (6 1/4 inches)
Cactus by Georg Jensen (with black horn) 6 5/8 inches
Cactus by Georg Jensen (with natural horn) 6 5/8 inches
Beaded by Georg Jensen (with stainless tines) 6 1/4 inches