Seems to be a Tonak from the period when the knowledge was still there. I'll be posting a "gazela" later today as well. Not a Tonak though.Tonak "Gazela" possibly mid 1950s.
Back in January 2015 I received this book "170th (1799 - 1969) Anniversary of TONAK" (actually 24 Years). No mention of Hückel (146 Years, 1799 - 1945) on the cover.