I thought I remembered that I'd bought a reproduction advertisement for chocolate about 18 months ago. Maybe I did but the only card of that type I can find is this one for butter.
Beurre d'Isigny is still widely available today as a premium type of butter made in a specific area of northern France - and nowhere else is allowed use the name, rather like champagne. The Bretel-Frères started off in 1865 by exporting eggs and salted butter to England but then in 1871 set up production of butter in Valognes. The ad dates from 1900.
This is a post for Postcard Friendship Friday hosted on Beth Niquette's blog, The Best Hearts are Crunchy.