Ha, “All Things Schwinn”,
This Copper ‘65 bike in question is just a beginner’s Sting-ray.
A no frills (far less chrome) version, compared to the big boys Sting-ray.
The ‘65 Stingray and Junior share the same frame and chain guard. Just a different screen on the guard.
You are able to compare part numbers on GTGary Junior spec sheet and my full size spec sheet from January ‘65 which shows what components were shared and were not.
That is not a High Loop strut. It’s a late ‘65 and newer slider seat strut.
There are some valuable items on this modified Junior for a builder?
My Black J39-1 is a CA = March 10, 1965.
This Coppertone J48 Junior is a CA = March 12, 1965.