Apple - Refurbished Excellent - iMac 27-Inch "Core i5" 3.0 (5K, 2019) 8GB - 1TB FUSION DRIVE - Silver

Since the iMac is refurbished, it will come with a clean installation of macOS rather than the original operating system it shipped with. Refurbished devices are typically reset and updated to a compatible macOS version during the refurbishment process. If needed, the system can also be updated further through System Settings > Software Update once the device is set up.