When these show up on auction sites these days, sellers tend to ask $2500 or more for them. I've seen several such auctions, and the bases and plaques on the bases seem to vary. I don't know if they originally had different bases, or if some of them might be replacement bases added over the years. The one shown below was auctioned by Heritage Auctions in 2024, and it doesn't have a plaque at all.

Recipients apparently also received a two-page promotional newspaper, which can also be seen below.

More info and speculation about these can be found in this 2011 blog post on The Jaws Blog.

King Kong (Paramount, 1976), Kong Maquette. Vintage original maquette of King Kong, holding a commercial model helicopter, constructed from lightweight cast resin and painted bronze, mounted on a wooden base. Designed by legendary effects artist Carlo Rambaldi (Alien, E.T. the Extra-Terrestrial, Silver Bullet), this was a rare crew gift, with very few known to exist. The model helicopter was attached for display using adhesive resin. Measuring approx. 26" x 21" x 7", with base measuring 10" x 10" x 3". Exhibits light scuffing, age and the model helicopter blades are slightly loose with light chipping at base.