I picked up another monkey wrench at an estate sale this morning. It's an 11" Billings & Spencer.
On side of wrench:
A capital "B" surrounded by a triangle, then the words: The Billings & Spencer Co. Hartford, Conn. 11 in. followed by a capital "G".
Here are a couple pics along with the 10", wood handled Stillson I picked up last week. They've got your name on 'em if interested.
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