Introduced in 1966 as the successor to the 320 series, the Datsun 520 and 521 trucks were mechanically quite similar to the Bluebird 410 and 510 sedans. As a lightweight, reasonably efficient truck that drove more like a small car, the Datsun truck became popular with people who didn't need the capacity of a full sized truck, but still had occasional hauling needs. The 521 received a facelift as compared to the 520, with a so-called "flat-deck" style. This meant a flattened hood and a new grille design. The 520/521 trucks where succeeded by the Datsun 620 in 1972.