Nice photos, but you haven't really given the folks here much to go on. Unfortunately, there are myriad schemes/formats for serial numbers. Unless someone recognizes the pattern as a distinctive one, that won't be too much help without other salient clues. Good photos of the area around the seat post entry, fork crown and front dropouts might help a bit. The rear dropout does not appear to be forged, which suggests either that the bike is fairly old (1960s), or a cheaper model. I don't recognize that one, as a mass-manufactured item, but that doesn't mean much -- maybe someone will.