Nice find! Burgers is the oldest Dutch brand, and were known for making excellent bicycles at reasonable prices. You have got a good bike.
The reference to the late Prince Hendrik is interesting and kind of funny. I'm not sure he ever rode a bike, but he was known to fraternize with the sports community and liked to share a drink (or two) with the sportsmen.
One story says his life was once saved by a couple of speed skaters at the 1928 winter Olympics when he fell down, got stuck in the snow and was too drunk to get out by himself.
More interesting story from a cycling point of view is that of the 1925 World Championships. For some reason someone had thought it to be a good idea to organize this race in Holland, even though road racing had been prohibited there since 1905. They even chose the Veluwe area for the race, which is a predominantly orthodox protestant area.
So, no racing, no shorts.
This is what they did. They made sure there was no race by having control points, where policemen would put a stamp on the riders' race numbers. The race was stopped for lunch. Prince Hendrik asked the riders to "not ride too fast, please".
There actually is some footage of that "race". Even more surprisingly, there was a "winner".
World Road Race Championship 1925