WW2 Letter From Marine To Mother Was Part Of Prop For Promotion Of TV Programme!!

Hey team iv just acquired this, its not yet in my possession so shouldnt really jump the gun so to speak, however, I am very curious as to what it is.
Its not usually my thing to collect war letters as I feel they are incredibly personal.. and should always be with family.
Could you please advise me on this?
It may be a prop?

Edit: so very much a prop!! Oh well bit of history there
http://theinspirationroom.com/daily...eal-stories/

Not really a prop. Props are things that were used in the filming of a movie or TV show or used on stage in a play or the like. This is a piece of modern advertising sent by mass mailings to large groups of local households. This kind of advertising is sometimes called junk mail. It is the same category of mail you get from all kinds of companies who are trying to get you to buy something, or in this case to watch a new TV series. This piece of advertising mail happens to be interesting to postal history collectors as it is in the form of a WW 2 letter home.