This is the old Citadel Orc War Wyvern, which is from the Games Workshop archive and was on display at Warhammer World.
TA3 stood for Tony Ackland. Tony was one of the early artists, designers and sculptors for Citadel Miniatures (and Games Workshop).
An early release for Warhammer, I do in fact have one of these, somewhere! I remember having real issues gluing the wings using an epoxy resin glue, which I used back them to stick models together. Even then I then added lots of Milliput to keep them attached to the body. Today I would probably need to pin the wings to the body and use green stuff to fill the gaps.
Games Workshop have recently re-released a newer resin version of a old (but not as old as this one) metal Orc War Wyvern kit for Warhammer: The Old World.