Pair of rare black glass enamelled art deco vases

An unusual pair of art deco vases made of black glass with a gold and white hand enamelled geometric design. It is rare to find black glass and these are signed, but signature not known. No chips or cracks, slight wear to the gilding, please see photos. 

Dimensions: 16cm ( 6.25") high x 5.5cm (2.25") across base

Weight 450 grams each (15.9 oz)

Condition: good

Origin: Bohemia c1930