This is an antique Yukon Silver warranted sugar spoon.
The composition of this spoon is unknown but is likely an alloy that does not contain any silver.
It is in the "shell" pattern and was a premium offer from Raymond Manufacturing Company. You filled out a coupon, sent it in, and got a free sugar spoon, and a set of 5 matching teaspoons. You were then supposed to try to sell at least 2 sets of the teaspoons, if you failed to do so you sent them back.
This spoon measures 5.25" long and has a shell on the handle and a shell-shaped bowl.
The spoon is in good pre-owned condition.