From WikiApiary, tracking Nostalgia and over 3,200 other skins

Name: Nostalgia (ID: 11826) Default skin image
Author(s): No authors provided.
Description: Nostalgia was one of the skins which is bundled with MediaWiki by default. It was a skin which looked like Wikipedia did in its first year (2001). It was removed from MediaWiki Core in version 1.22 but recreated as an separate extension at the same time.
Tags: obsolete, removed
Related extensions: This skin has no related extensions.
Derived from: This skin is not derived from another skin.
Website count: 6101 (32.73%) (Skipped on 29 sites.)
Websites using as default 1
Websites skipping it 29
Segments Day: 3 Hour: 18

Nostalgia is default skin on websites:

Nostalgia is an available skin on websites: