Can you help to identify these frames, bikes or parts?

Ok, first check...
Scales are working fine. 125g yoghurt weighs in at 131g on the scales, which seems about right allowing for the packaging.

Off to the basement again with the digital scales, giant spanner and a bottle of fine Belgian beer (La Chouffe)...

Fork off. Various bits of headset off too.

Second check...
Fork + several bits of headset = 816g
Frame with rest of headset (+bb) = 2112g
2112g + 816g = 2928g (stacks up against the 2925g original weigh-in)

So, without hammering the rest of the headset off the frame...
Headset weight is approx 200g.
Say half of that weight is on the scales with the fork?
2112g - 100g = 2012g.

BB weight approx 300g?
2012g - 300g = 1712g

I took off the seat bolt, but still on the frame are the rear dropout screws, and the bottle cage screws. I'm going to take that lot as 12g.

So that gives me a frame weight of 1.700 kg (give or take about 50g I reckon).

The frame is 52cm, so upscaling that to 54cm would surely not be more than 1.800 kg...?

The acid test is the weight (the fact that yours has no chrome rules
is out for a high end frame). A bianchi Specialissima in Columbus SL
should weigh no more than 1925gr, frame only.

Your three tube tretubi del mondo will likely be 2100gr+.

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