The only known working Stim weapon extant, one of possibly three or four that were made for production (however, only two were seen to be actually "extended" on-screen making them working HERO versions). The Stim body is spring loaded into the metal tube handle of the weapon, which then extends out when a trigger on the underside is depressed. This Stim has been ID'ed on-screen in the hands of a Tyranian Training School "Teacher". Originally acquired from the estate sale of costume designer William (Bill) Ware Theiss, who also did the costumes for the original Star Trek series.
