Here is a very early Panton lamp. The Topan lamp with a difusor were only produced 1959.

To the left you can also see a Topan lamp with reflector. That one came 1965. In the background you can see a “regular” Topan lamp without a difusor or reflector.

There is a really good website about danish designer lamps. Here you can read more about the Topan lamp by Verner Panton:
http://www.vintage-danish-lights.com/a-tale-of-two-topans-the-pendant-and-the-spot

Since earlier, I have a prototype for a wall Topan lamp. It was probably made 1958/1959.

You can see it below.