I have an iMac 27in, late 2012 model, bought late 2014, Sierra compatible. Includes wireless keyboard and trackpad.
$525 shipped to lower 48. Works perfectly. Specs in pic
https://photos.app.goo.gl/vD2ay88MbQ9XJx346
$525 shipped to lower 48. Works perfectly. Specs in pic
https://photos.app.goo.gl/vD2ay88MbQ9XJx346