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Select "About this Mac". You will find the serial number and year of the machine in this window.

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Compatible Model:
MacBook Pro 15" Retina A1398

Compatible Subfamily :
MacBookPro10,1 Retina Mid 2012: MC975LL/A (2.3 Core i7)
MacBookPro10,1 Retina Mid 2012: MC976LL/A (2.6 Core i7)
MacBookPro10,1 Retina Mid 2012: MD831LL/A (2.7 Core i7)
MacBookPro10,1 Early 2013: ME664LL/A (2.4 Core i7)
MacBookPro10,1 Early 2013: ME665LL/A (2.7 Core i7)
MacBookPro10,1 Early 2013: ME698LL/A (2.8 Core i7)
MacBookPro11,2 Late 2013 (IG): ME293LL/A (2.0 Core i7)
MacBookPro11,2 Late 2013 (IG): ME293LL/A (2.3 Core i7)
MacBookPro11,2 Late 2013 (IG): ME293LL/A (2.6 Core i7)
MacBookPro11,2 Mid 2014 (IG): MGXA2LL/A (2.2 Core i7)
MacBookPro11,2 Mid 2014 (IG): MGXA2LL/A (2.5 Core i7)
MacBookPro11,2 Mid 2014 (IG): MGXA2LL/A (2.8 Core i7)
MacBookPro11,3 Late 2013 (DG): ME294LL/A (2.3 Core i7)
MacBookPro11,3 Late 2013 (DG): ME294LL/A (2.6 Core i7)
MacBookPro11,3 Mid 2014 (DG): MGXC2LL/A (2.5 Core i7)
MacBookPro11,3 Mid 2014 (DG): MGXC2LL/A (2.8 Core i7)

Printed Part #:
821-1610-A, 821-1538-02, 821-1538-03, 821-1610-02, 821-1904-02, 821-1904-A

APN:
661-6532, 661-8311