The F2T was a special ultra-rugged version of the F2 (DE-1 head) with titanium bayonet mount, top and bottom plates, and camera back, plus a special DE-1T titanium covered meterless prism head, sold in parallel with the regular F2s from 1978 to 1980.
The F2 Titan was a black only late variant of the F2T, distinguished by the word "Titan" engraved in Roman script on the front of the camera below the shutter release.