I don't remember using a resonator before but the 4093 gates and this 10Mhz device only gave 4.325Mhz. Question .. Is is possible is wrongly marked ? Seems unlikely but no other conclusion....The clock only fed the Z80 during measurement....
I am not sure why, but I have on the desk a Z80 and PIC18 as a loader / supervisor project, at first the pic provided Z80 clock, so I could debug easier , but now wanted the Z80 to run at the 10Mhz as ' it said on the tin' , not pursuing the resonator but have adopted a 10Mhz Xtal / 4093 . oscillator instead.