From what I recall, and this may be corrected, is the ones that were made in Italy actually said on the decals 'made in Italy' on the Benotto decal on the seat tube.
The Mexican made ones just had 'Benotto Torino .... ' on the decal. With later not mentioning where built.
There seems to be a bit of snobbery about with regards whether frame is Italy or Mexico, both handmade with decent tubing, upper and lower model ranges in incremental quality.
I am sure there are a few ' friday afternoon' weld jobs from both Italian and Mexican ranges.
Before I get crucified by Mexican and Italian welders and Benotto owners I must stress these are my memories and opinions and like the rest of my life they may not be based on actual reality
Carlsberg dont build Singlespeeds but if they did.......they would probably look just like mine.
I've spent half my life on bikes.........the other half I wasted