This dealer-installed reference makes a lot of sense to me.
I learned how to ride on what I believe to be an early 60s Schwinn Hornet.
Somewhere in the mid to later 60s, my parents bought me my first new bike, from back then, at one of the larger reknown Schwinn dealers, Kozy's Cyclery on the S/W side of Chicago.
I still remember the creaks in the wooden floor where I picked up my brand new mid 60s Coppertone Fenderless Stingray with a Bendix 2-speed kickback. The oddity was that this bike was a "stripped" model.
My bike had no front squeeze brake and a "smoothie" silver glitter seat.
All the upper end Stingray's with 2-speeds typically had a padded/ribbed seat and front squeeze brake....mine had neither.
With the size of Kozy's store and all the repair activities I saw going on during my visits, it is easily conceivable that I got a basic/stripped Coppertone Stingray coaster that was "upgraded" with a 2-speed hub.
Makes some real sense now.....