mystery old sailboat boat part, wooden handmade: Mast Spar Boom? Support Arm?

Description

You know more about this item than I do!
Single-handed Gin Pole?  (To aid in lowering and raising the mast on a small trailered sailboat.)
Gaff?
Boom?
Boom Crutch?
Mast Spar Boom Support Arm?
Tiller extension off a small daysailor sailboat?
Boom Crutch?
It is placed upright as you show it at the aft end of the boom to hold it up when the ship is in harbor and sails are down and gathered. The main sheets are pulled tight to hold it in place, and sailors have space to pass from port to starboard underneath.
Or ? Mystery part from an old sailboat. Handmade, out of wood. Measures approx. 71-1/8" Long, end to end. Open spacing area on end measures approx. 6-1/4" Across. Item is in ACCEPTABLE condition for its age. Has age wear, cracking, discoloration/ staining, and dust soiling. Sold as found. See pictures for details and condition. Pictures taken with flash. Will be shipped without a box.
Ask questions before you bid/buy. Allow up to three business days for handling.
Seller Note: G