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No maker marks, The main body is 45 inches.
All info/prices would be appreciated.
These should give you some ideas. Antique, for sure....prices, variable! :)
You called it a "wooden bar clamp" which is EXACTLY correct, which means you know what it is. Some similar ones were home-made and can be purchased today for $20.56 according to their ad.
Yours is missing a piece that attaches to the round, threaded part. Without it the round end would dent the piece being held.