Skins from The Overpass Collection are not obtainable through the weekly drop.
The Overpass Collection is a Valve-made collection of CS:GO skins introduced on 1 July 2014. The collection consists of 5 consumer skins, 4 industrial skins, 3 mil-spec skins, 2 restricted skins, 1 classified skins, and 0 covert skins.
The Overpass Collection is inspired by the demolition map known as 'Overpass' which appears in the game-modes Casual and Competitive. Many of the CS:GO skins in this collection feature a variety of themes and textures that resemble the graffiti and colour palette of the map.
The skin patterns Master Piece, Road Rash, Pink DDPAT, VariCamo Blue and Detour are exclusive to the Overpass Collection.