Moto Guzzi Nuovo Falcone.

This one was a spectacle to behold, Especially that mad exhaust thing.
There's some text I found on t'internet about this suckah.
"This was a total redesign of the much-loved and famous Falcone. While looking very similar in appearance, the engine and cycle parts were upgraded greatly from the original. The original Falcone had a non-unit looking engine and gearbox with magneto ignition and a dry sump. The Nuovo Falcone has unit construction, coil and battery ignition and wet sump. The final chain drive was also moved to the left. The huge external flywheel was retained, but hidden under an alloy cover (except for the bottom edge, that can still be seen whirling beneath the left footrest). The cycle parts were also upgraded. " To read more go here