The improved titanium-bladed shutter from the Nikon FE2 was adapted to the FM2 in 1984 and X-sync increased to 1/250th second. The new camera was renamed the Nikon FM2n (New FM2 in the Japanese market), but remained marked FM2. The only external differences were the red 250 setting on the shutter speed dial and the N serial number prefix. Advances in metallurgy proved the suitability of high-strength aluminum as a substitute for the expensive titanium used in the shutter, and was adopted for the FM2n in 1989. The only way to identify the different versions is to inspect the shutter—the early FM2n had honeycombed shutter blades and the late FM2n had smooth blades.