CAMBRIDGE DECAGON LOT OF 3, LIGHT (ICE) BLUE, SERVER & CREAMER/SUGAR- 1 w/ mark

Description

I am offering three pieces of Cambridge glass:
A 10.5" server (sandwich/biscuit/cookie),
and a sugar/creamer set.
The creamer is marked with the C in an inverted triangle.
They are beautifully preserved in their original condition.
There are two small black spots on the edge of the server.
I have no idea what they are.