I just noted that the book "Die Siegwart und die edle, freie Glasmacherkunst", edited by Dominik Siegwart (mentioned in my first posting) is available online via
Google Books.
There is also a transcription published by
Pressglas-Korrespondenz. Whilst the text is still in German only, it contains (in addition to the original text) reproductions of historic glass catalogues (example pages) - scroll down to:
p.39: Siegwart; Flühli and Hergiswil (1857)
p.40: Glashütte Franc, Contat & Comp.; Monthey (2nd half 19th century)
p.41: Glashütte Franc, Contat & Comp.; Monthey (2nd half 19th century)
p.42: Siegwart & Co; Hergiswil and Küsnacht (shortly after 1900)
p.43: Siegwart & Co; Hergiswil (about 1924)