1" wrench, about 5 1/2" long. I'll assume that this is the same Jacobs of Jacob Chucks, though I can only find reference to the Jacobs Rubberflex collets which doesn't seem to use this type of wrench. They're not uncommon, Ebay has listings for several.
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It's 31/32" per that catalog (charts on pgs 7&8), so close to 1" and is used (on the flats) with the 420 and 421 series of chucks (the drawings of the nut and body wrenches don't appear to be to scale). I don't have any hands-on experience with the these chucks but I can't imagine the catalog is wrong.
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