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I feel like I should know what this is for, but I’m drawing a blank.
Champion? Spark plug related?
Google image search is baffled , it seems.
From a friend’s collection.
He doesn’t know either!
3/8 drive , no ratchet, only turns part way.

That's the Champion spark plug emblem so I'd guess it's a tool for cleaning a plug or gapping it.

Look for more on Champion "CT483"

Looks like it may be a spark plug ratchet that also torques. Here is a link to one being sold on eBay.
https://www.ebay.com/itm/389490806957

I tried to do a relatively quick search of the Patent number "1511925" which is expired. Since all the patent records I could find on the web don't list them by number, but only by applicant (company and/or inventor), best I could do is tag the patent number being issued sometime in the early to mid-1920s.

It's definitely supposed to ratchet, so mechanism is probably just seized up.

Aha, so with these hints, I figured it out.
It takes a spark plug socket, and in the loosening direction,it locks and removes the spark plug.
Then in the tightening direction that blade notch engages a spring ball and clicks at a preset torque.
From the feel of it, that spring is worn out and clicks too easily.
Maybe why there aren’t many around anymore?
Curious, does anyone use a torque wrench on spark plugs?
I never have. Just going by the pressure needed to compress the
Washer on a new plug. Not very much in pounds!
Thank you all for looking at this🤓

Thanks for the explanation in how it works. I was trying to figure that out but came up blank. I agree it’s just a conversation piece at this point in its life, but that will stump allot of mechanic’s, especially the younger generation!

I've never use a torque wrench on plugs either. Just like you said, enough to compress the washer and maybe just a touch more.

That's what I found when searching on the web for "Champion CT483." It came up with a spark plug gapping tool, but I think that's a reuse of the part number. I don't see how that thing could attach to a socket without bending the blade on the end.

SteelonSteel, can you post a pic of how it works? My curiosity is piqued. [on edit] I see from the eBay link that Phil posted that it has a stub for the socket to fit on. That explains the mystery. So it's a rudimentary torque wrench. Added a picture from that eBay listing.

I tried a patent number search on the number Dan posted and it came up with a "pocketed table" describing the legs folding into pockets issued in 1924 invented by August F Wasmuth.

Off topic, but I also remember a spark plug shaving device that some race engine builders used to trim the gasket surface of the plug shell down, along with a torque wrench, to clock the ground electrodes at exactly the same position for every cylinder. Now, that's really getting ridiculous about "blueprinting"!
Jerry

Yes , Jerry, but you wouldn’t want your spark flying off in all directions !
So, one last point on the Champion spark plug tool.
I decided the spring tension is actually fine.
There isn’t actually a click, just bottoms out and you probably go slightly tighter.
I’m guessing these were given out by the Champion distributor to shops etc.
Designed to help with young and not so young shop workers with a heavy hand.
Then you could remove the plugs without a cheater pipe 😂
Maybe they didn’t get used much