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I haven't got a set of callipers, but measured the shell as 69mm wide x 37mm diameter.
The frame is a Davanti, which as far as I know is a generic alloy frame branded by a bike shop here in Holland.
The bb says BB-7420, BC1.37x24T, 68. It's sold as "FSA RPM JIS Square Taper Bottom Bracket BB-7420AL BSA-68-ST"
I've added a photo of the threads as well.
The frame isn't French or Italian is it? Actually, what is the frame?
Start from scratch: (accurately) measure the width and diameter of the shell, then post the details here together with what is written on the bottom bracket.
It's not easy trying to diagnose things remotely: no details and no photos just make it even harder.