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@doctor_john
It's difficult to recognize the SL tubing without compare it with a known SL frame.
Even then you have a great possibility being wrong depending on your experience
and the choices of the framemaker.
I think that it's better to look for the (size first of all) quality of the parts, the craftsmanship
and the condition of the frame.
For instance, traditionally on sl tubesets use lugs with "lilys" but they are common lugs to depend.
also most of the italian builders use italian threaded BB.
If that helps, mine SL frames weight unpainted almost 1670gr the 55x55.5 and 1830gr the 58x56.5
Wearing columbus and gippiemme rear drop outs correspondingly and CNC bridges.
I'm not an expert, i just like them.