The processor is a 1.2 GHz processor but it is takted as 1.3 GHz.
The Core M is not available with 1.3 GHz.
The same with the 1.2 GHz model. That is a 1.1 GHz processor witch is takted as a 1.2 GHz one.
FYI, in EngliIsh, the German verb "takten" is "to clock", so for non-German speakers, your point is that the Core-M base frequencies are actually 1.1 and 1.2GHz, which are clocked 100MHz higher by Apple's implementation.