• Can anyone tell me something about the group?

    Already did - it's 1050 with STI* added later. That places it somewhere between the mid 80s.

    *Now that we've seen the close up, it's clear that the STI levers are quite a recent addition, look like Sora ST-3300 but somebody familiar with low end Shimano will know for sure, or you could just look for the part number stamped on them somewhere.

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