Aston Martin DB3/3, originally a standard-bodied car, but had the rear end rebuilt by Henri Chapron in 1952 after an accident involving several cars at Monaco. Soon after it caught fire at a race at Goodwood and had to be completely rebuilt.
Later it was sold to French racing driver Michel Poberejsky who had it re-bodied by Vignale and who fitted a DB3S engine.
After another accident the body was fitted to a Ferrari 340 America for the subsequent 50 years of its life.
I don't know what happened to chassis no. 3 in the end, but the puzzle photo shows it wearing its Vignale body in the mid 1950s.
Here's another pic for good measure: