These bikes were only manufactured in 2014 and 2015, as indicated by an either an 'E' or an 'F' in the serial number, for a total run of only about 3,000, most in 2014. Some countries other than the US also have a stamped date that some speculate is an export or import date. Here's more about the meaning of your serial number, found on the left side in front of the tank if you turn the handlebars to the right:
VIN# JH2SC68N1EK000658 (SEQUENCE NUMBER IS 0658)
J – JAPAN
H – HONDA
2 – 2 WHEELED VEHICLE
SC68 = GL1800C
1 – CHECK DIGIT
E – 2014
K –PLANT = KUMAMOTO, JAPAN (M = HAMAMATASU) (S=SUZUKA)
000658 SERIAL NUMBER FOR THAT YEAR
The highest reported number on multiple discussion sites, so far, is EK001850 for 2014, and FK000228 for 2015.