H2 gold rimmed lenox china

I have a collection of ivory colored gold rimmed china thought to be from around 1915. The bottom of each piece has a Logo "L" followed by: " LENOX made expressly for Frederick Keer's and sons Newark NJ". Painted on the bottom of each piece is a different set of numbers, for example one says "843/M2" another is "842/H2". I'd like to know how much this collection is worth, or how to go about finding this out. I have pictures available