Your basic tribble, used in the production of DS9 episode Trials And Tribble-ations, in which Sisko and the crew of the Defiant travel back in time to prevent the assassination of Kirk onboard Station K-7.
When I was a kid, I bought 3 original series screen-used tribbles from David Gerrold. I kept them with me for many years, despite multiple moves across country. Sadly, they were all ultimately lost to (different) girlfriends.
From Roddenberry.com.
