Oh, Oh, oh....... H.(Henri) Roux(Snap) Underlever.... Yes, it was used by most on the early hahn(hammmer) dreilings until the makers were able to sort the tube selection process.


[Linked Image from thumbs2.imgbox.com]
Although the underlever looks similar, this is actually a Berger-Pleß-Collath type underlever. I don't think it serves the same function as the Henri Roux, but it might??

Serbus,

Raimey
rse