When I see sewing notions (at the thrift store or if we happen to stop at a yard sale) -- a box with a package of unopened Singer needles, some pins, a few bobbins, spools of thread, and buttons -- all for a dollar, they're mine. This bobbin and a few others were in a box I bought last year.
I know this isn't the clearest photo but I think you can see enough detail. The owner of this bobbin tied the end of the thread around one of the holes in the bobbin, then wound some thread onto the bobbin. And then she used a different color of thread, tied it around one of the holes, and wound more thread. And repeated the process several more times. There were five different colors of thread on this bobbin.
Did she wind all the thread on the same day? Did she use the first color and then later, when she needed a different color, wind the second color onto the same bobbin, perhaps because she didn't have but one or two bobbins? I'm puzzled about why she tied the thread around the holes. (They were so tightly tied I had a hard time getting the point of my seam ripper under the thread.) Do you tie the ends of thread around the hole in the bobbin?
I am always fascinated by others' sewing notions. Are you, too?