My dad bought me one just like this when I was a young ham in 1962. He paid $19.95 for it at a local electronic supply house (Peninsula Electronics) in Salinas, CA.  I was so happy to get it as it got me away from a straight key. I developed my CW speed on it and used this bug for many years.
This weekend I ran across one just like it on eBay and it was a had to have. So glad to have one again for if nothing else the memories it brings. Looks a bit dusty  but should clean up fine.