I have about 24 tires or so in my inventory. All but 8 are Goodyears, mostly the SC3 or SC3R, and four are an oddball German made SuperSport R for Porsches. All the 3 and 3Rs have the seperate # on the inner shoulder that is nowhere the manufacture date (in parentheses), 0305 (0323), 0317 (1223), 0310 (1922), 0420 (1421), 2017 (3420). Some, but not all of them do have the manufacture date on both the outer and inner shoulder, in the correct spot as per the NHTSA info. I also had read that the manufacturer is not required to put the date on both sidewalls.