I think this style is usually used during the 1950's and I think I'm seeing a vague "51" on the stamp.
Thanks for your reply Aleks.
No one think other thing? no chances to be an original pouch?
I think Alek is right.
It has the look and feel but it isn't.
All the best
It is an original pouch, but for post-war period.
All time while PPSH was on storage - pouches and other accesories were made for them in large number.
At least two types of fastenings were used during the war for PPSh ammo pouches - one was a wooden peg, and another metal buckle with leather strap as visible here above (sources: e.g. A.Mollo, A.Shalito "Red Army Uniforms of World War II in Colour Photographs (Europa Militaria)" page 55, Philippe Rio "The Soviet Soldier 1941-1945" page 88). So, this type of the ammo puch was used widely during the war. However, the marking / stamp is not clear and it is hardly to say whether is it a wartime production or not (I have no data as regards styles of stamps used during and after the war - if someone has, the source of information / examples for confirmation would be welcomed).