Wow, awesome find! Congrats. [emoji106]
I clearly live in the wrong place, lol. No luck with flea markets, estate sales, etc.. I have done well in the bay in the past, including a Slim from this past summer. That brings up a question...
When you clean TTOs do you usually oil the "gears", so to speak? I like to put mineral oil (I use baby oil because it's a readily available MO) in the main shaft, on the door hinges, and at the dial for adjusting the level. Not certain if it helps much, but my black handle birth year certainly doesn't squeak anymore.