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@cybernck
Looking nice!
What's the BB threading on it?
Hit the middle of the downtube with your fingernail - R531 has a distinctive crystalish ping to it, rather than the dull sound of Columbus tubing.
However, depends what you compare it to but at ~2.7-2.75 kg for bare frame & fork, it's generally not exactly lightweight per se. It's "normal", I'd say.
Google for seatpost sizes etc for specific type of tubing but there have usually been several sizes for the same tubing, so it can't be used as a definitive telltale.
Hope this helps, Nikica.