I just bought this bike, but it seems like the frame is not Bianchi, all marks and texts are stickers. Also, there are quite a few logos on the frame. Does anyone know which frame this is?
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I'm thinking it looks a lot like the Hans Lutz logo:
German manufacturer, ex racer...
I'm not sure he made just lugs, for Bianchi at that. So I think you're correct about it being rebranded. Silly really, the Hans Lutz I've seen is nice stuff!
Note the color of the frame too, very similar to that pictured. I can also vouch that the bidon holder mount holes on yours look exactly the same as those on the frame pictured here.
Initially I thought this was an Olmo but it looks like Japanese bike frame builder 3RENSHO.
You can see some on Google or here: https://www.flickr.com/photos/39068621@N08/4620234666