Oh I dunno, I sure would have bought that for $60 if it had crossed my path: it's got loads of style and even with ashtabula cranks they are the slickest ashtabulas I ever saw.
But I always thought Diamant was a German or sometimes Belgian brand, this one clearly says "Oslo" on the badge...was Diamant an international firm, or are they 2 or 3 different marques?