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Top one is T3
Which comes with a fork drilled for a front brake. And it was called P3T before they decided to change the name, suggesting that dual use was always contemplated, if your obsessive dedication to taxonomy is to be respected. You could always pretend it's a couple of years older, because P3Ts just said P3 on the side because people could be trusted to work out that it was the track/fixed TT version from the absence of dérailleur hangers and the 120mm OLN back end.
Well no.. Top one is T3 not a P3. T as in track (not P as in prologue).