Could be reformatted using Bootcamp to install Windows. This is the late 2013 27" iMac. It is running Mac OS Catalina 10.15.7.
Apple 27” iMac A1419 - Outer Packaging & Inner Foam + Manual & 2x Stickers USED*
Apple iMac 27 Box Empty Outer Box / Packaging ONLY For 27" iMac - See photos
Apple i7 iMac 27 Inch Mid 2011
Apple 27" 5K iMac - 3.2GHz Core i5 8GB macOS 12 Monterey
Apple Intel iMac 27" display with wired keyboard & Mouse plus packaging
