BS 377 - Single thread chainstitch button sewing machine. This machine is equipped with quick stitch-shape mechanism and with special knot-tying mechanism to prevent the unravelling of stitches.
BS 473 - Single thread chainstitch button sewing machine, for sewing on flat 2 and 4 button holes. Optional clamps for shank-stay-wrapped buttons and snap fasteners available. Equipped with automatic underbed thread trimmer.