27" iMac with no operating system. plus accessories (Nailsea BS48)

IMac 27", with Apple wireless keyboard, Magic track pad, Apple remote, Apple USB 4way extender, Apple power lead, and Apple protective dust cover.
Unit boots, but has NO operating system.
Requires macOS 10.13 High Sierra operating system
Late 2011 model,
Spec is: 2.7Ghz i5 quad core processor, 4Gb DDR3 RAM, 1Tb SATA hdd, AMD Radeon HD6770 512Mb graphics
Dvd drive works, no dead pixels.
In excellent cosmetic condition.
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