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Message: <blockquote data-quote="MacBiter" data-source="post: 1944881" data-attributes="member: 421638">That's generally true, however it's not always straightforward. My 2011 iMac came with Lion which was the latest OS when the iMac was manufactured. HOWEVER.. that particular iMac model was manufactured over about 18 months and the first part of that was when Snow Leopard was the OS of the time, and so the seller was able to install OS 10.6 over 10.7. I suspect that may be the case with yours? In other words, the model first came with 10.12 but was still being manufactured when 10.13 came out - so although 10.13 was the default OS for that  Mac, it was capable of running 10.12 as the firmware hadn't changed.</blockquote>