Tubus is sold, @flash Flyer is this one: https://www.brooksengland.com/en_uk/flyer-aged-1.html so fits on a normal seatpost, but does have a second rail under the leather as show in this picture: https://cdn.brooksengland.com/media/catalog/product/cache/0/image/1000x625/602f0fa2c1f0d1ba5e241f914e856ff9/f/l/flyer_aged_back_view_brooks_england.png
@miller 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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Tubus is sold, @flash Flyer is this one: https://www.brooksengland.com/en_uk/flyer-aged-1.html
so fits on a normal seatpost, but does have a second rail under the leather as show in this picture:
https://cdn.brooksengland.com/media/catalog/product/cache/0/image/1000x625/602f0fa2c1f0d1ba5e241f914e856ff9/f/l/flyer_aged_back_view_brooks_england.png