Up for sale here is this set of 4 new vintage-style black & silver-colored knobs. These are numbered, and are about 7/8" in diameter at the numbered part, so just a little under 1". They are for a 6mm shaft, but will fit a 1/4" ribbed or 1/4" D shaft, or you can use a reamer or drill bit to slightly enlarge them. These each use one flat-head set screw (included) to lock on. These are really neat knobs. Please see my pictures for details and dimensions.
US shipping and handling is $7, and international is $24. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.