What rims/hubs are on your High Sierras? My 87 has a Maillard Made in France front hub (with possible date code stamped 1 14 87) laced to a Kinlin Made in Taiwan 26 x 1.5 rim, and out back there is a JoyTech A87 sealed bearing hub laced to an Araya Made in Japan 26 x 1.50 rim. Definitely 2 different style rims.
I see some of you have mentioned that your Sierra/High Sierra have Araya rims. Not sure which one, but I am leaning towards the rear wheel/hub having been replaced at some point.
FWIW it has a 6 speed Shimano MF-Z012 freewheel.
Front
Rear