This is an exceptional attic mint example of a Dyottville cylinder, one of the nicer ones I've seen. Check out the awesome pontil with nearly full residue. ! This is an early 2-part mold example. The top is a hand applied double taper.

Embossed:  (shoulder) / PATENT / (base) DYOTTVILLE GLASS WORKS PHILADA

Height:  11 1/2" 

Color: deep olive black glass