A Very Rare Bristol Blue Egg Cup c1800

Description

Heading : A blue glass egg cup with applied white rim
Period : George III 1780-1820
Origin : England 
Colour : Bristol blue
Bowl : Saucer top
Stem : Plain
Foot : Conical 
Pontil : Snapped
Glass Type : Lead 
Size :  8cm height.  5.8cm diameter bowl. 5.1 diameter foot 
Condition : Excellent.No chips or cracks. There is a prominent shear mark on the underside of the foot. this is from manudacture
Restoration : None 
Weight:  130grams