Whatever it is that's going on with that seat tube shifter, I love it. Google Translate isn't quite up to the task, what does it do?
It engages the dynamo on the chain stays. Not unusual.
Oh. Less exciting than I had hoped. Thought it was some sort of bodged front shifter thing to deal with the weird chainring sizes.
Someone on here had a frame with a boss in the same place and wanted to know what it was, anyone remember who?
@Lolo started
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Whatever it is that's going on with that seat tube shifter, I love it. Google Translate isn't quite up to the task, what does it do?