cords that work with the 201 are very common and easy to get. When Singer first started with electric machines, they tried a few different types before going with that style which they kept for - oh, 20-30 years or longer. And made so many, many machines that used it that it's still readily available after market.
This style came out around 1929 or so. Before that, they used the male/female connections, the cord split and had one on each end. If you tip your machine back, you may find that those wires in the cabinet go into the machine and connect to the machine that way.
One of the earliest styles of cords has a light bulb end on the "plug in the wall" end, from before outlets were the norm. So to run the machine, you screwed that end into a light bulb fixture. I really want to find one of those for my collection! Then I'll get a vintage light bulb wall fixture to use with it (though I'll put that on a cord).