If you really want to have some fun mark the gun Slotter and Co. instead of Deringer. One, or more of the Slotterbek brothers( who worked for Deringer at one time) built Deringer pistols that were so good there are arguments going on today, in some collectors circles, and museums, over if the Deringer marked pistol they have is the real thing, or a Slotter copy. After the patent infringement trial in San Francisco, ( Deringer vs. Plate) Slotter at least had to quit marking his guns Deringer, and started marking them Slotter. Any Deringer with a Calif. dealers stamp on the barrel is definitely suspect.
Hungry Horse