This Slotter-made derringer pistol is retailer marked for R. Liddle of San Francisco, a name that rarely turns up. It is a .44 caliber with a 2 1/4-inch barrel and 6-inch overall length, listed used as antique handgun SKU AH4460. The barrel reads Made for / R. Liddle & Co / San FRANCo CALa, while both the breech plug and lock are stamped Slotter & Co / Philla.

Condition-wise, the barrel is sharp and nice but carries no original finish, and the furniture is nicely engraved. Slotter-marked derringers are hard to find, and the double marking of Philadelphia maker and West Coast retailer is what sets this one apart for a Delaware collector of pocket pistols. Transfer is through a licensed dealer, with the state purchaser permit or carry license, photo ID, Form 4473 and a background check, and handgun buyers must be 21 or older.

Key features

• .44 caliber, 2 1/4-inch barrel, 6 inches overall
• Retailer marked R. Liddle & Co, San Francisco
• Breech plug and lock marked Slotter & Co, Philadelphia
• Engraved furniture, no original barrel finish
• Used, SKU AH4460

It ships to a Delaware FFL dealer you name at checkout, who completes the paperwork before handing it over.