Halyard
Gave this a little more thought. It used to be pretty common to use "rope-to-wire" for halyards, the wire portion being attached to the sail and the rope portion for your hands and winches.What you are probably seeing is the remnants of a halyard that probably got away and has a shackle sitting at the top of the mast. You are seeing just a bit (I didn't ask if there is a big coil of line attached) of the line, and then the start of the wire portion entering the mast.If you've got servicable main and jib halyards, this was probably an extra jib halyard, or possibly a spinnaker halyard.Take a pair of binoculars and look over the top of the mast from the deck - looking for an open shackle.Happy Hunting!Tim BroganApril IV C350 #68Seattle