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"Is this an ex-Norwegian 12cm Armstrong gun?

we got the following info from Sascha Kuhnert

It is not a 12 cm Armstrong gun, it is a russian 152/45 Canet coastal gun
Model 1892.

The typical mark for this gun is the smale rail adjustment behind the swing
breech block at the end of gun tube. Its a support for the swing brech
block, when it turns out of the tupe in order to open the gun chamber for

Please take a look at these picture :
[http://www.navweaps.com/Weapons/WNRussian_6-45_m1892.htm] and also
[http://commons.wikimedia.org/wiki/Category:Canet_152_mm/45_naval_gun?uselang=de]and compare them with your picture.Russian adopted the basic french Canet gun system during 1890s and startedto produce ownversions of 75mm, 120mm, and 152mm guns for their coastal defence,especially to equip the new russian coast defenceof Peter the Great in the Baltic Area. But they had been also used on shipsof the Russian Navy, for example on the cruiser Aurora. After the russianrevolution 1917 these guns still remained in the service of russian army andnavy, but also in now independent "ex russian" countries like Finnland orEstonia, these guns remaind in use. In the case of Finnland even until1980s.Unfortunatly I can not tell you anything about the location of your pictureand as I told, these guns had been not only in use by Russia. But so far Ihave never heard anything about a use of these guns in Norway, but whoknows? Is it shure that the picture was taken in Norway?One thing is for shure, the picture is not taken in Finnland, because mostof the finnish 152/45 had been technically updated by turning the whole guntube 180 degrees inside the gun carriagein order to improve the shooting range. What means that these guns have thebuffers on top of the tube, and not under the tupe - like in your picture.I thing the picture was taken somewhere in Russia, maybe even in the BalticArea.Anyway I hope I could help you and the team of Atlantikwall Research Norway.If you have any further questions in this case, feel free to ask.

Soldiers posing infront of a 3,7 cm C/30 Marine flak. Any idea of where this picture was taken ?