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Shifts the rear mech now, but I don't think the original build was like that, since there are cable guides at the headtube.
My Specialized Sequoia had a shifter mounted on the seat tube too, but that was more a lever to control the dynamo that was positioned between bottom bracket and tyre/wheel. So I guess this Koga had the same system.
Why is there a down tube shifter on the seat tube?
EDIT: No bosses on the downtube, but why would you add a boss on the seat tube?