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Officially there was no gun with this name - official French documents appear to talk about the "de 145" and "de 145/155". The gun was designed so the barrel could be bored out to 155mm from 145mm so it doesn't represent a new type of gun by just changing the calibre. I think the information about Italy acquiring these guns between the wars is suspect - Kosar says not - more likely the Germans gave the Italians captured St-Chamond guns after the fall of France.

There's a bunch of strange stuff about the French using the St-Chamond guns for coastal defence - the French had plenty of 14cm guns they could use for coastal defence without having to reverse engineer land carriages. The St-Chamond gun was still a useful field piece at the start of WW2 and the French Army used it as a heavy artillery gun.

This article and the article on the 145mm gun seems to have a problem with adding the accents to French names. It is "Modèle" not "Modele" The accents are easy to add to the texts since the html tags work well.