I don't see any difference between the barrel of "Timide" and the other 320 mm Mle 1917. Am I missing something?

According to Guy François, only "Atchoum" was different as a 340mm Mle 1893.
Emmanuel
320mm Mle 1870/30 ??Emmanuel wrote
...and the bottom picture a 320 mm Mle 1870/30 gun. Both guns were mounted on carriages of 320 mm Mle 1870-81 guns.
Guy Francois in "Les canons de la Victoire. Tome 2 Pag.39" also mentioned a 274mm Mle 1893-96 gunEmmanuel wrote
I think it is a 274 mm Mle 1887/93. The only Mle 93/96 I know is the 305 mm Mle 1893/96.
I think we're talking about different guns. You're referring to the 274mm Mle 1893-96 sur affut a berceau Schneider (Guy Francois "Les canons de la Victoire. Tome 2 Pag.38) and I am referring to the 274mm Mle 1893-96 sur affut a glissement SchneiderEmmanuel wrote
You’re right for a 274 mm Mle 93/96. I found several mentions of this gun from various sources in my notes. However, the carriage of the 274 mm Mle 93/96 looks very different from the carriage of the 274 mm Mle 87/93 ("affût à glissement de 320 mm Mle 1870-81"). See the pictures posted by jopearya on February 17, 2011 at 09:51:
viewtopic.php?f=70&t=114126&p=1560085#p1560085
Where the 53cm gun was being operated? I know the true story of demolition of an unknown heavy German "mortar" (probably railway) close to Strelna in Dec. 1941 by rockets of a single Soviet fighter I-16, piloted by Matzievich.Manuferey wrote:It does indeed.
In addition, the same picture also appeared on ebay.de a year ago along with another picture showing the whole gun. The caption mentioned "52 cm RUSSLAND 1941".
Only one gun remained in 1940 in the French inventory. It was used by the Germans in the siege of Leningrad and blew up on January 5, 1942 due to a defective shell. So the picture would indeed have been taken at the end of 1941.
Emmanuel