Can someone translate/tell me something about this envelope?

[m2013d04]

I was gifted this envelope by a WWII veteran who picked it up in Japan. Can anyone tell me what period it is from? (I assume it's from around WWII but im not sure if the veteran visited Japan after the war and picked it up there) and what does it translates to? I got a Japanese friend to translate a bit, and he said it mentions something about scenery, so maybe a movie/film? And yes, it is an envelope, not a flyer/piece of paper.

[ghp95134]

特選風景
Tokusen fūkei
Choice Scenery/Landscapes

奥多摩鳩の巣
Okutama Hato-no-Su
Okutama Hato Valley [literally: Pidgeon's Nest]

最新撮影
Latest/newest Photography

Okutama
Hatonosu Valley

-- Guy

[m2013d04]

Oh wow, thanks! So I assume it's advertising a valley in Okutama? or could it have been something to hold photos of the valley in? Because it is an envelope that you can put stuff inside of

[ghp95134]

It would have held a series of postcards similar to this one, of the same location:



-- Guy

[Nick Komiya]

The marking on the back allows it to be dated to wartime and is explained here.

[m2013d04]

Thanks for the help!