Slowly I am restoring an early 70's Raleigh Sprite. This is one of those Sprite models where the serial number isn't much help in dating the bicycle, but it does have a rather distictive chain guard that is best described as half a hockey stick. Anyhow, the bicycle has a single chain ring and 3-speed Huret (Allvit) rear deraileur. My question concerns the thumb shifter. It is attached to the stem (doesn't seem right to me) and is made by Falcon (also doesn't seem like original equipment to me). The thumb shifter is made of pot metal (I think), looks pretty cheap for something on a Raleigh bicycle and again, doesn't seem like original equipment. Any idea what company made the original equipment thumb shifter or is the one I have it? What about where it is mounted?

Terry