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Bought an Atlas TH36 that was in pretty rough aesthetic shape (will post restoration pics once I'm finished) and it came with this intriguing automatic tailstock drill chuck with the markings: Broderna Gronkvist Katrineholm, Sweden

It's been used but the mechanism works quite well.

Anyone know what it's worth? I'm not sure I want to use it, and I'd rather exchange its value for something I'd use...

Can you post some pics? If it's what I think it is, I might be interested. No idea what it's worth though.

It's an MT2.

I am assuming the front part turns while you hold the rear part to close up the jaws yes? If so then I believe it is just a very old version of a keyless chuck, I have seen similar before.

The large section rotates against a spring loaded action, which rebounds and grips the drill bit.

I stand corrected - that is not even close to what I was thinking.

It's very cool though.

Yeah, it is pretty cool. The lathe I'd be using it on is still in as many pieces as I could break it down for cleaning/painting, so it's going to be a bit before I can test it for any kind of accuracy. The action is still very smooth, although the jaws don't automatically open... you have to kind of wiggle the drill bit in there. I doubt that's the way it should be. I might dissect it and clean it out. The lathe I got looked like it had never been truly cleaned. It had a couple of paint jobs over the factory paint, but I discovered that those were just painted over much of the grime in the corners and stuff. Pretty nasty. Interesting project though...and it's going to be sweet once finished.