Skins from The St. Marc Collection are not obtainable through the weekly drop.
The St. Marc Collection is a Valve-made collection of CS:GO skins introduced on 18 November 2019. The collection consists of 5 consumer skins, 4 industrial skins, 4 mil-spec skins, 3 restricted skins, 1 classified skins, and 1 covert skins.
This collection was exclusive to players who had activated an Operation Shattered Web Battle Pass and was only available for the duration of the operation. It did not return for the following CS:GO operation - Broken Fang.