Bratři Lobosický, Praha X
Company doesn't exists yet.
Key Rum is trademark from 1925 and now is owned by Stok Plzeň-Božkov.
[Source: Stok Plzen-Bozkov, cited 2000]
The company was nationalized on October 18, 1948.
[Source: epravo, cited 2014]
Here are full texts from the labels
cz_46: Key Rum; Bratří Lobosický