Original Collins S-Line main tuning knob. Black, skirted, finger hole, silver insert. Excellent shape $20 Set of knobs for Heath SB-100/1/2, HW-100/1/2 Large main tuning, 10 smaller, NO lever knobs. Green, silver inserts, silver skirts, black arrowhead indeces. Excellent shape $20 plus postage 73 John b