Farberware
Specs clearly published farberwarecookware.com ↗
Plastic-free almost by inheritance rather than intent: the Yosemite percolator is an old-school all-metal design where the entire brew path — pot, stem, basket, spreader — is stainless steel, with plastic confined to the exterior handle and a glass perk knob. Farberware doesn't market this as plastic-free; it just happens to be a cheap, coating-free way to brew because the design predates the nonstick era. Nothing in the food path touches plastic.
How clear are their specs?
Simple, visible materials — steel body and brew path, plastic handle, glass knob — with no coatings or hidden liners to disclose. What you see is what you get.