Ron posted details of some 19th century German beers including one from an unknown source in Bremen claiming to be IPA.
At the time I speculated that, since Bremen is a port, it might well have been English beer just bottled and/or sold locally.
Turns out I was probably wrong. There was a Bremen brewery making IPA and it seems pretty likely that that could have been the one in Ron's table.
It also might not have been the first. Another Bremen enterprise founded in 1815 was trading as “Englische Bierbrauerei Deetjen et Claussen” by 1832.
I must admit I have done no great detective work on this. Both the information and the label scans come from Klaus Ehm's fascinating breweriana collectors' site.