A guy at the Alameda Antique faire ( San Francisco Bay area) found them in a storage locker in Martinez, Ca. I bought some and other Chippers have bought some as well. I don't know how many are out there but it seems like more and more are popping up. After posting them a couple months back ...someone emailed me off the board and said that the symbols meant "south six" or six south". I don't remember the exact terminology. You are missing one color. Green with Brown inserts. ( I think it's brown..It could be Maroon)😀