The V-80 was built as a demonstrator of a single-seat fighter export version of the 03U-4 with four forward-firing machine guns and an enclosed cockpit.  Three V-80P’s were sold to Peru and one V-80F to Argentina.  The payment for the Peruvian aircraft was made in guano since the country was bankrupt.  How, and to whom, the fertilizer was sold is not clear but company books show that payment was received.  The demonstrator was later converted to the V-135.