Il mio amico ha questa vecchia bottiglia di birra del suo bisnonno che è emigrato in America. Sono curioso di sapere se in Germania producono ancora qualcosa del genere e che tipo di birra è?

I think they might still be made as tourist souvenirs. And this is clearly a tourist souvenir: it says “Greetings from Rhineland-Palatinate to Germany”, while the text below tells of all the things that Rhineland-Palatinate has that “Germany” doesn’t. The picture shows the Rhine Gorge, and the woman of course represents the Loreley.

Of course, Rhineland-Palatinate is famous for wine, not beer. And the state didn’t even exist until 1946, so this isn’t an antique: it’s clearly post-war.

I don’t know what it contains. Perhaps a higher-quality picture taken in a good light would show the seal at the top a bit better.

It’s a tourist gift

Thats a Tourist Gift, but you can buy a Siphon similar to this from some Breweries and get it filled up with fresh beer at the Brewery to take it home and drink it within few days.