About a year and a half ago when I started collecting I was visiting a friend in Cape Breton Island, Canada. When I told him of my new hobby he assured me that there were a couple of insulators in his Mom's old shed. He was right. We found a handful of very common CDs and this thing. I didn't even know it was a keeper. Anyway a year and a half later I am glad to have my 136.4. It holds a special place on my shelf.