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Thanks for posting this Sandnes cykkel!

The forum has had several discussion threads on DBS bicycles. If interested, you could use the search function to bring them up. Company still going today but no longer does manufacturing.

Are the seat stay braze-ons mounting points for a wheel lock?

Similar arrangement on a Crescent bicycle -





Monark (MCB) advert of '74 for a mechanism of their design -



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