I can't work out if these are Regency or later copies. Firstly their density is 2.5gms/cc. so not lead crystal. They are 12cms. tall and the feet are wider than the bowls and different sizes, 6mm./5.5mm. and 5.8mm./5.2mm. Both have striations on the bowls and feet, small tool marks on the rims and ground pontils. The double knop stems are similar to ones shown on P.47 of Hajdamach, in the Webb Richardson catalogue. It may not show in the photo but they have the most intense Manganese green glow I've seen.