This really has me stumped. I cannot any similar marked items using Google. Not that they don't exist, but google is not finding any.
The other significant thing is it seems to be from a woman. "Alphonsine" (The distinctly feminine form of "Alphonse"


English Translation
December 30, 1915
My Dear Godmother,
I send you my best wishes for the New Year, as well as to your husband and your children.
I hope, dear godmother, that nothing bad has happened to you.
I have not had any news from you since December 1st.
And I hope that you have received the letter that I sent you 3 weeks ago.
The package that you announced to me on 12-1-1915 has not arrived, probably it is lost.
I finish, dear godmother, by sending you my most sincere wishes.
Your God Child,
Alphonsine
The Recipient's Address
Madame Ethan P... (The recipient's name, partially obscured by the cross-out marks)
444 Ave de la...80 West 40 Street
New-York
(Google AI scrambled the address)
Expéditeur :
A. Ringuet
104e d'Artillerie
11e Batterie
Secteur 111