Unfortunately I don't have a torch setup, so if I am forced to disassemble it would be with an angle grinder and reassemble with a mig welder. But, since it's stainless, it would be a big hassle so that's my last resort. My goal is to find a hose barb that would screw onto the threaded pipe, replacing the compression cap.
My dad and I used to be in business together. We had a customer who used a lot of chemicals and pressure to create semiconductor crystals. They went out of business and left a lot of equipment in our facility. I wasn't yet into home brewing when this happened. We kept their stuff in case they ever wanted it back. Flash forward 6 years, I'm now well into home brewing and I remembered my dad still had this SS coil, so I took it from him and here we are.
TL;DR it's from a custom piece of equipment, it was definitely used for heat exchanging, but I can't trace it back to a manufacturer or ask anyone about it because the company doesn't exist anymore