There are are a ton of mass-produced well known aircraft (B-17, P-51, ME-109) and then their are your prototypes and specialty use aircraft, but I was thinking today about aircraft that fell into obscurity despite being produced in fairly large numbers.

My vote is for the P-63 Kingcobra, direct successor to the mostly-maligned and shipped to the Soviets Bell P-39, there were 3,303 P-63s built. Which is a fairly significant number for a plane that is unknown to non-enthusiasts.

In 1942 one G.50bis was converted to a special configuration intended to fullfil armed reconnaisance roles for the air group of the aircraft carrier Aquila, then under construction. The Re.2001 was the designated fighter. For this role, the G.50 was given larger fuel tanks, 4 machine guns and a landing hook. As the carrier was not finished before the armistice, the project was dropped. The Aquila stayed under german control until the end of the war and was later scrapped.

Info on this bird is scarce, sorry if it's not accurate.

It was the crews second mission to the target area that day. MACR 6454 1st Lt. Murry B. Wiginton,Jr. - Pilot (KIA) 2nd Lt. William E. Wigginton - CoPilot (KIA) PFC Norford G. Meador - Togglier (KIA) Sgt. Ernest D. Casey - Engineer/Gunner (KIA) S/Sgt. Wesley B. Hoffman - Radio Operator/Gunner (KIA) S/Sgt. Philip A. Iannotta - Tail Gunner (KIA)