If you provide close ups of lugs around headtube, bottom bracket and seat cluster, these can sometimes give a clue. Also when the bike's upside down there may be an ID mark stamped into the BB.
@rive_gauche started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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If you provide close ups of lugs around headtube, bottom bracket and seat cluster, these can sometimes give a clue. Also when the bike's upside down there may be an ID mark stamped into the BB.