This is a Tudor Crystal Frobisher pattern whisky or Double Old Fashioned tumbler .   

The glass is in excellent condition for its age.  It shows age related wear and tear to the rim of the foot consistent with som use.  

The glass has a bucket-shaped bowl measuring 8.7 cm (3.5 inches) in diameter at the rim.  The bowl is cut with large ovals in the Frobisher pattern and ends in a star-cut base  The glass is 9 cm (3.5 inches) in height.    There are no chips, cracks, significant scratches or any obvious signs of restoration.   It carries the "Tudor England" maker's mark to the underside edge of the base.

Lead glass weighing in at 405 g. ( ~ 14 oz.).    9243