This is a single demitasse spoon. It could also be used as a master salt or mustard spoon. It is a vintage Tiffany & CO M spoon. It think it is an A.J. Fuller special collection piece.
It is 4 1/8" long and weighs a sizable 12.8 grams.
It is in excellent condition with no dings or repairs.
Estate Tiffany & CO Demitasse Spoon