This is an older, well known design and as you guess it, designed by some italian with the last name of Marconi:
This kite is made by Gomberg Kites from the USA.
Well, the kite is pretty sure made in China (as it is with about 95 % of all kites worldwide) and the quality is okay, but could be better.
After I got some tips (extrem tension on the line between the wingtips and using a heavier line), this kite flies now nicely and stable!
Wingspan: 120 cm, Height: 120 cm