I didn’t really need another counter. Moreover I really, really didn’t need another broken counter to repair because I don’t have the time to repair it.
However I could’t resist this one: it came with the HP10544A crystal oscillator and it measures up to 500MHz (and even higher… not to talk about the plugins). My other counters will stop around 100MHz.
I’ll talk more about this unit when I will fix it (hopefully) but if you are curious you can read the June 1974 issue of the HP Journal.