Oh, interesting! Thanks for the quick response and detail, Phil! I thought the “Hand Chased” thing meant it is silver but it is good to know it is electroplated. Also, thank you very much for the info on the spoon! That is cooler than I thought.
A search for LC Co leads me to Help with identifying this maker - SMP Silver Salon Forums which has a picture with much better imprinting of the maker’s mark. The discussion over there suggests that their items are pre-1890. There is also a suggestion that the marks are import/export marks…did that happen? Would they have marked the spoon but not the mustard if it were a set?