Offered is this unused replacement phonograph mainspring, "Honest Quaker" brand, no. 66.
I looked it up on a phonograph reference site, it says this part is for "Eureka, Premier, and United No. 6 and 7-2-S". The spring is 1" wide, 0.028" thick, and 14 feet in length, with "special pear shape ends".
It's in the well worn and incomplete original box, and the spring itself has the original heavy wire retainer around the periphery. There is some rust on the spring. The box is approximately 3-1/2 by 3-1/2, and is 1 inch thick.
I hope someone can use it!