Nikomat/Nikkormat FT/FS
The Nikomat FT (Japan) or Nikkormat FT (elsewhere) was introduced in 1965. Original Nikomat body with averaging metering (like the Nikon F Photomic T). No shutter speed display in viewfinder, meter needle brackets are thin without "+" and "-" markings, and the meter is manually indexed against the film speed.
The Nikomat FS (Japan) or Nikkormat FS (elsewhere) was also introduced in 1965. Non-metered version of above. No mirror lockup.