This is one of my unicorns. But it looks bigger than a 54cm
Catalogue says 54.5 TT is the smallest size they did, it's too long for me, and too expensive IMO, and needs a clean.... Super cool though, GLWS
The small had a 126mm headtube.
The medium a 142mm
I would guess OPs one is actually a medium (56cm eff TT) as it looks quite a bit bigger than this example
Although, geo may have changed over the years. I know the wishbone style went from welded tubes to a cast unit in later versions
@RodSaetan started
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This is one of my unicorns. But it looks bigger than a 54cm