From famous episode "The Trouble with Tribbles" ...

#1 : Beanbag Tribble from the collection of Art Director Matt Jefferies, with Authentication Letter from John Dwyer.

#2 : Special Fan Club Offer in the late ´70s, from Jack Townsend ( who was the President of the Walter Koenig Fan Club during 8 years ).

#3 : Baby, with Authentication Letter from David Gerrold.