It's a twisted handle adjustable wrench. The original was patented in 1883. I know ACME manufactured them in sizes ranging from 4" to 21" but not sure how long the production run was. There are a bunch for sale on Ebay.
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I know a lot about tools, but Ill be damd if I have ever seen one of these.
Does any one have another example of this?
Was there a wood handle covering the handle twist?
Brady