@Hansiurpils Welcome to WKC.
The handle that you have is not all that rare. That was the style from the mid-60's through '81-82 (with the earlier ones not having a Weber logo). What is uncommon is that it's screwed on. Most of these handles were riveted. There have been past discussions about whether these came on the kettles or were replacements.
Here is mine removed from the grill