The Z80 CPU has been manufactured by others, and various Z80s have been used in the construction of the CPC during its lifetime:
* Mostek MOSTEK MK3880N-4 [https://www.cpcwiki.eu/imgs/e/ee/MC0008D_Z70200_LeZone_PCB_Top.jpg Source]
* NEC D780C [https://www.cpcwiki.eu/imgs/c/c6/CPC464_270100_MC0001A_PCB_Top.jpg Source]
* SGS Z8400AB1 [https://www.cpcwiki.eu/imgs/5/52/CPC464_PCB_Top_%28Z70200_MC0002B%29.jpg Source]