If it is one of GAW Electronics Inc offerings it would be a 70's design and of one of two methods . a multi chip synthesizer much like the older SBE Formula D or based on the just available mc145106 or 145109 Motorola (I'll catch shit for this) derived from the Fairchild SM5104 line .
There were other PLL/Digital Dividers from that era but those are the common ones.
The rest of it would be a decade/BCD counter , several pierce oscillators and a colpits for fine tuning .
all that remains is stability and attenuation circuits .
shouldn't be that hard :-)
~kop