Giovanni Losa had a debilitating health crisis about 3 years ago and stopped building frames. His company no longer exists. Prior to that he was a respected third-party contract frame builder for many highly respected brands, including Cinelli (he built the steel Cinelli SC frames for a number of years).
Thanks a lot for the informations, I bought a frame of this brand past month in superb condition (like new), it was the bycicle reserve of a brazilian cyclist who participated of the Panamericam Games in Havana - Cuba in 1991. The frame was mounted but never used. I'd like to post pictures but I don't know how. Thanks again.