If people do not know, how do you want them to reply? Maybe you can contact KHS? Try https://khsbicycles.com/
More specifically:

KHS, Inc.
2840 E. Harcourt Street
Rancho Dominguez, CA 90221

USA Phone: 310-632-7173 Ext. 255

For other specs of the bike look at
https://www.bikepedia.com/Quickbike/Bikes.aspx