I got a chance to put two Nikon EM bodies side by side, and found that there are differences between them. Before I tell you, check them in my following images to find the differences yourself.
EM is a compact manual focus Nikon body, with a three-gears shutter switch, an ISO dial ranging between 25-1600, light meter and battery check buttons. The three gears of shutter switch are Auto, M90 and B. Basically, you set the aperture and EM light meter matches the shutter speed for you. If the speed is too low and miy causes shaking effect on your film, a warning sound will reminds you. A speed scale on the left side of viewfinder shows 1, 2, 4, 8, 15, 30, 60, 125, 250, 500 and 1000 (low speeds marked in red on the scale, At these speeds, you should pay attention about shaking). A needle indicates the speed engaged, and a mark indicates 1/90 s (for the M90 manual gear). EM is simple to use.
Finally, it's time to talk about the differences between Nikon EMs. See the first images, the body with SN 6197418 has blue buttons of meter and battery check, while the body with SN 7193581 has chromed buttons. If you are a camera collector, do you need to get both 'versions' of Nikon EM? And tell me if you find more differences among EM bodies. Thanks.