The BMW 1500 was introduced in 1962 and they were dubbed "Neu Klasse" sedans, the design and what it evolved into was what saved BMW and helped create the sports sedan and "ultimate driving machine" image that BMW has cultivated and grown with since then.
The 1500 was a 4 door sedan, and was later offered as the 1600, 1800, and 2000, all indicating engine size in ccs. They had 4 wheel independent suspension, and overhead cam engines, and were considered good handling cars with good performance with the larger engines. While the sedans were successful, they really hit it out of the park with the coupe versions, which looked a lot like the sedans, but had two doors, and were lighter and therefore faster and sportier. The 1600-2, (2 door) followed by the 2002 got glowing reports in the trade mags and sold well in the USA and around the world.
(Edit) BMW did make an 1802, but it was never officially sold in the states to my knowledge, but some may have found their way in by now, good spot.
Greg (new 2002 owner this fall)