Heavily-armed masked police arrested at least two suspects, one wearing a hood over his head, during the raids in the city's Neukoelln neighborhood.
"We assume that the two suspects match the ones seen on the video footage from surveillance cameras," police spokesman Winfrid Wenzel told The Associated Press.
He said searches of the apartments were still continuing, but so far the coin hadn't been found.
The Canadian "Big Maple Leaf" coin, worth several million euros (dollars), was stolen from the Bode museum in March. Police say the three-centimeter (1.2-inch) thick gold coin, with a diameter of 53 centimeters (20.9 inches) has a face value of 1 million Canadian dollars ($750,000). By weight alone, however, it would be worth almost $4.5 million at market prices. Police say the coin was likely damaged in the theft.
Police had published footage from surveillance video asking the public for help in finding the thieves.
The coin, which has an image of Queen Elizabeth II on one side and maple leaves on the other, was on loan from a private, unidentified person, dpa reported. It's one of only five that were made by the Royal Canadian Mint.