My emergency generator says “Cycle” “50″ on the generator. Does that mean it is not for 60 cycle electric?

I inherited an emergency Honda electrical generator.. the generator side is American made and looks very standard to me, but oddly enough, it says "Cycle 50" on the generator. Now, I thought all electric in the US was 60 cycles per sectond. Why in the world does this say 50. Do I have an oddball thing here that is useless, or is this probably just a misprint or a misundestanding on my part.

I want to use the generator to run my small well pump in emergency if the electric goes out.