Saurer bus type 4ZP of the VBZ.
Hans Krebs
CC BY-SA 4.0
ETH-Bibliothek Zürich, Bildarchiv / Fotograf: Krebs, Hans / Com_L26-0009-0029-0002 / CC BY-SA 4.0 / <a rel="nofollow" class="external free" href="https://doi.org/10.3932/ethz-a-001122916">http://doi.org/10.3932/ethz-a-001122916</a>