The majority of the Orion skins are painted black and have orange along the edges. The Slider of the gun has an animal-like pattern made up of gray and black stripes. The silencer has a black base and is adorned with orange dots, and has 'USP-S' written on it. This collection only has one skin in it, and that is the USP-S | Orion.
The skin was added to the game on 1 May 2014. It is part of The Huntsman collection. However, it is no longer obtainable from the Huntsman Weapon Case, as it was removed from the game. The skin itself still exists in-game and can be used in trade-up contracts.
The price of the USP-S Orion can range anywhere between $10 up to a couple of hundred dollars.
Check out other CS:GO skins families: