The profile of the Stem has an awesome Chalice-Like Stem and Beveled or Tapered Base ! Ca. 1870-80's.
Blown/Molded 2 Part Cobalt Blue Glass Eye Wash and Fire Polished Smooth ! (no mold lines)
Hand-Blown round Bowl was then pinched oval into Eye Shape.
Only 2 5/8 inches (67mm) High.Eye Cup is 1 3/4 inches(45mm) across and 1 inch(26mm) Wide. Base is 1 5/8 inches(40mm) in diameter.
I could only find one other Example in Ref.: "Miller's Glass Buyers Guide" Book Octopus Publishing Co. From : 2001 ISBN 1-84000-361-8 English name : Blue Glass Eye Cup (2 3/4 inches high) Page : 299
Condition : Excellent with no damage whatsoever ! For the sake of accuracy,there is a glass residual pimple, or raised clump of glass inside the eye cup, no deductions due to a normal blown glass production imperfection.
Weight : 2.3 Ounces.