I was in a thrift store a few weeks back and ran across a 6D Kel Lite for $15.Naturally I grabbed it.Couldome home and get on their website and start trying to determine the manufacture date.Plastic switch with D-6 markings. Smooth tail cap with Barstow marking.I email them and ask. Don Keller emails me back.Explaining this to non flashoholics would be like saying youbought an iPad and Steve Jobs answered your email.Anyway. Don said he had parts left and I needed anything just let him know.I said I always wanted a small head 2C. "Let me check." A few days later I now posses two Kel Lites. One of which has been a grail light for many years.Thanks, Don!!