Green Knob Pipe. Blown glass pipe with green knobs, a yellow cap or disc, blue frit and color changing. Blown in Oregon by Harold Ludeman. 5 inches long. $50 includes s&h in the USA. You get the pipe you see. More pics upon request. Questions please ask. Available at The Darkside Redding Ca. (530) 246-1773 – Smokemyglass.com.