Sold at auction for $11,350.
The finely crafted curiosa German silver ring revolver, the band engraved with herringbone borders and legend: Femme Fatale. Top mounted with 7-shot brown-finished cylinder with fold-down fire-blued trigger and outer spring band. Contained with accompanying seven cartridges and tiny screwdriver in green velvet-lined, dark red leather-covered ring case with silver button escutcheon reading: "Femme Fatale."
Previously: Pistol ring and other unusual guns
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects