Excellent eBay seller! (what type of thread is this?)

[SUP]

@Aven Thank you. I will look at it. It's fun to learn something new to me that is an old technique. 

[chiefjason]

Got something similar from a buddy.  He gets it in Maine and told me they use it for repairing sails, IIRC.  It's thicker than I use most of the time.  He uses it on his leather belt buckles