Antec NSK 3480 computer case, with high-efficiency power supply and noise-reduction features.
Used in a working build, then stashed away in a closet when I purchased a new computer a few years ago.
0.8mm cold-rolled steel construction
High-efficiency 80 PLUS certified power supply (EarthWatts 380W ATX12v v2.2)
Active PFC (power factor correction)
Designed for quiet operation with multiple thermal zones, soft hard drive grommets, and wide-open air intakes
You can see the full product info here: https://www.newegg.com/black-silver-antec-new-solution-micro-atx-mid-tower/p/N82E16811129035
A detailed review is here: https://silentpcreview.com/antec-nsk-3480-80-plus-case/