Is This Smoke Glass Jug Blenko?

It has this smoke gray color that has a tint of blue that's very similar to many other Blenko pieces.
This one is 11" tall and 8" diameter and has a pontil on the bottom.
There's a similar Blenko piece on eBay called the Optic Jug #963, as stated by the seller which has a similar design but not quite the same.
Any help or confirmation on this would be greatly appreciated!
Thanks!