What is the name of the company which produces the liqueur used in the Rusty Nail? 
Rusty Nail (cocktail): A Rusty Nail is made by mixing Drambuie and Scotch whisky. Drambuie: Drambuie is a golden coloured, 40% ABV liqueur made from scotch whisky, honey, herbs and spices. Drambuie:  It has been produced under contract at the Morrison Bowmore Distillers facility at Springburn Bond, Glasgow since 2010.
Morrison Bowmore Distillers