Ride heavy metal.
Join Date: Sep 2009
Location: Teenage Wasteland, USA
Bikes: '74 Raleigh LTD-3, '76 Motobecane Grand Jubile, '83 Fuji TSIII (customized commuter), '10 Mercier Kilo WT (fixed obsession), '83 Bianchi Alloro, '92 Bridgestone MB-1 (project), '83 Specialized Expedition (project), '79 Peugeot UO-8 (sold)
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I doubt it's a crack, looks more like just staining of the unfinished steel that's been exposed to friction or moisture or something. You see that a lot with older steel tubing.
Personally, I wouldn't call it a crack yet -- if you're worried do the penetrant inspection.