1856 20 centimes Empire Non Dentele cover from Berry-au-Bac

 The Petits Chiffres is 376 Berry-au-Bac, in the Aisne department.

It is a commercial letter:

It bears the 'APRES LE DEPART' mark.

Here is the stamp:

The stamps has small plate flaws to upper left and upper right cartouches.

It is a type I.