Mark, I think Ralph had the date right as near as I can figure, too.
Here is one I just sold today (yesterday?) on eBay:
scroll down to see an image and comments from a 1963 Ron Kitching catalogue... (and of course to admire the ancient box it came with).
BOB HANSON, ALBUQUERQUE, NEW MEXICO, USA
**************Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15&ncid=aolhom00030000000001)