I'm unspooling a Penn model 49 deep sea fishing reel I just purchased. It appears to have a wound thin cable steel line on it. Does anyone know the brand?

This was used for fresh deep water trolling for lake trout.

It could be a thin steel cable like some people might use as a leader for very toothy fish, but i would bet that it is actually a lead-core trolling line that the previous owner was using to gets his lures down deep. Walleye angles use them too from time to time. To my knowledge, there are a number of manufacturers that make them, so I couldn't tell you where yours came from. Starting the search with "lead core fishing line" should hopefully point you in the right direction though. Good luck!

It's not lead. It's actually very thin steel wound mini cable. The outside looks like a tiny snake skin it's wound so perfect. It's very tough to cut.

Sevenstrand and Monel wire line are common for wire lining lake trout.

Tom