Another heavy siege gun, this one is from the Austro-Hungarian Empire, the powerful 42 cm autohaubitze M17, from the well known Skoda Works.
Originally built as a coastal defence howitzer in a turntable carriege with and armoured dome, but it was much more useful as siege artillery; even so, only 8 pieces were built.
After WWI, Czechoslovakia inherited one howitzer, which under czech service was known as 42 cm houfnice vz. 17, after en ocupation of the country by German forces, it was known as the 42 cm Haubitze(t).
Its is depicted as in the western front 1940, in a dunkel grau paint schemed. It was used to shell the Maginot Line at the Ouvrage Schoenenbourg, and later to shell also Leningrad and Sevastopol. Cheers.