The SH-3 has a filter that was found to infringe on a Moog filter patent. Roland was forced to change the design and released the SH-3A. Because of this, the original SH-3 had a limited production run and is quite rare.
Year Released: 1976
Keyboard: 44 keys
Roland SH-3A 1974 analog synth SH 3 ($1,046.59)