Dates to 1920's ~ Unsigned but probably Czech /German in Origin.
Measurements ~ Necklace is 15 3/4 inches in total length x max width of 1/2 inches ~Pendant adds 1 3/4 inches in drop length x 1 1/2 inches wide .
Condition ~ Considering its age I will say its necklace is in good old condition ~ No major cracks or chips to the central glass cab ,only for one tiny flea bite size nick on the back side (not noticeable ) ~ Metal discoloration /darkeing seen ~Clasp is in good working order