1872. It is when they started fabricating the very french casquette, caps. That's how the shop looked at the end of the 19th century:
And this a casquette, a very french one:
Nowadays, they are selling all kinds of headgear as well!
La fabrique de casquettes dans la Grand Rue. Ils en font et en vendent depuis 1872, voir photo du millieu. Mais aussi d'autres chapeaux, berets, etc.