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As far as I know (although best ask Winston) there's an official logo/headbadge (see below), which was designed by a graphic designer friend of mine at the time Winston did my frame. He had a few laser cut then and I've seen it on his frames since (maybe not all of them though maybe some people didn't want it).
But in terms of main tubes decals I don't have the impression there is anything official, I've seen several variations.
And some 1990s MTB nostalgia, kind of...