Weekend Cooking: Princess Sandwiches

Chop sufficient cold chicken to make a half pint, add the juice of half a lemon, two tablespoonfuls of melted butter or olive oil, twelve walnuts chopped very fine, a half teaspoonful of paprika and a half teaspoonful of salt. Put this mixture between thin slices of buttered bread, trim the crusts and cut into fingers.

From Sandwiches by S. T. Rorer (1894 US)

According to wikipedia, it shares the same name as a Bulgarian sandwich dish, which is an open-faced baked sandwiches prepared with minced meat. They don't seem to be related in origin. though.