mid 70s.
Now we know what GE did with all the extra parts from the various brands they manufactured at the time(JCPenny/Penncrest/GE/Hotpoint)
Throw the extra parts together in hodpodge:
install the dryer door handle too close to the edge of the door(just to be different)
use a Penncrest side swing top for the washer
use JCPenny knobs
use beige, panel insert free, Hotpoint control panels
with GE Chrome end panel trim pieces.
and
ship it to Canada.