MacBook "Core M" 1.1 12" (Early 2015). MacBook "Core M" 1.2 12" (Early 2015). MacBook "Core M" 1.3 12" (Early 2015). In this window, you will find the serial number and the year of the machine. Enter this information into the search field on theEveryMac website, which will provide you with comprehensive specifications for your system.
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