Traditionally, that first digit was used by Nikon like this. Nikon Camera Serial Numbers Nikon has long used the first digit of the serial number to indicate region for many of their products (all the way back into the film SLR era). Serial numbers of the Nikon FM started at 2100001. Much more numerous, less expensive younger brother of the Nikon One and Nikon MĬamera, because of its durability and versatility.
