but they have all been "amateur" built.
AIUI this is incorrect and LAAwill administer factory -built "orphans" which no-longer have support (from the type-certificate holder?)..assuming there is one.
In any event, my pal owned a share in an Aeronca Chief....definitely factory-built, definitely on a Permit, no electrics other than Mags for the Donk.... We did have an Icom handheld and eventually he lashed-out on a SLA battery and intercom....LOOXURY !...dirt-cheap flying but because of it's huge wingspan, hangarage was dear and the draggy airframe meant it was a wee bit thirsty. A great-fun, leisurly cruiser, though.
It was sold at no loss after several years . Although I'm unsure of the financial arrangements, I know a fellow did "buy" it ,or a share in it, and successfully learned to fly in it! including his final skills test.