Keyboard arrived, excellent packaging. Tested, and is in perfect working order with my Macbook air.
Also tested with my Win10 PC and worked perfectly with it. Doesn’t work with setting BIOS (of course, no bluetooth-only keyboard will) but works fine for login, waking up PC from sleep / hibernate etc.
For future reference, this is the A1314 (2 battery) 4-generation model (with Expose / Mission Control keys) that works fine with Win10. My old keyboard was the A1255, that doesn’t play with Win10.
Pleasure dealing with Karma12, thanks for the sale.