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@1_n
http://www.bikeforums.net/showthread.php/369168-My-1985-Benotto-Modelo-3000
There's a whole thread here about cracking frames as you describe.
If you have bought the frame and its fine then just use it.
I had a zeta Benotto in the eighties and it was fine.
If it cracks at the bottom bracket it can be fixed but it is a large job to fix as the builder would be heating an area with a lot of tube junctions which is going to weaken the existing welds in that area and probably not worth doing as its only zeta tubing.