Sidesword, 15th century.
(from the style, I would say Italian, end of the 1400)
These low-resolution photos are all I could find.
I can speculate a 1000-1100g for the piece, with a 90cm or so long blade that is 3.5-3.7cm wide.
(in Istanbul Military Museum)
Spanish sidesword, 15th C. (I would say, second half)
(in Istanbul Military Museum)