Duke Nukem's throne from the game Duke Nukem Forever.
Part of a larger Duke Nukem Forever props pack found here: https://garrysmods.org/download/3612/duke-nukem-forever-props-redon
This is not mine, and I had absolutely nothing to do with its porting to GMod, I merely separated the throne-specific files and am uploading them here for those who (like me) just want a god damn throne model and can not find a single good looking, royalty-worthy model of one anywhere (it was only after a week of searching that I stumbled across this). If you want the other Duke Nukem Forever props along with this throne model, follow the link above.
Just extract the contents into your usermods folder to install.
Crediting Jason278, because that's who is credited at the garrysmods.org page.