This German-language advertisement booklet from our collection is by itself a bit of a conundrum, but also reminds us of a puzzling episode that happened at the hotel during the Battle of Shanghai in 1937.
Before the electrification of China starting in 1882 and the introduction of battery-powered torches in the 1910s, oil lamps were the predominant means of illumination. They were cheap to manufacture & became popular promotional merchandise - most famously exemplified by the Standard Oil Company of New York (SOCONY).