Brazilian arms maker Taurus caused a stir when it released "The Judge" -- a revolver that fires shotguns shells in addition to handgun cartridges. The Judge shoots gauge shells as well as Long Colt cartridges.
Created by D. Oury of Belgium, the Novo revolver had a folding grip and trigger for easy carry. They were also completely made out of metal. Made in caliber, they were usually very ornate and marketed as purse guns for middle and upper class ladies.