French 47mm M34

[doppz92]

Hello, I have this 47mm Mle 1934 (47x 139R) which I believe was used in French tanks during WW2, but I cannot find more info about it. Could you tell me which tank/gun used this ammo and what kind of projectile were fitted on it. Last but not least, what's the purpose of having a 8mm longer case neck when the shoulder and the case body are identical to the well known 47x131 Hotchkiss?

 

[Nabob]

I have this case listed for "canon de 47 mm semi-automatique modèle 1934"

found this thread:
https://forum.axishistory.com/viewtopic.php?t=154362

 

[doppz92]

Very interesting, thank you Nabob.