I even gave you people a 2nd chance.
One obvious hint is the stuff about Maurice Vignaux that I left in on the right side. Anyone who knows Willie Hoppe's story will know when Vignaux would not have been challenging anyone. Also, those who know a little about Brunswick -- maybe there is something about their history on their website -- would have some idea of when they absorbed Collender and became Brunswick-Balke-Collender and Co.
1880.
And even if I'm wrong (highly likely), thanks to Bob for an enjoyable post and contest.
I also guess1876.