“maestro “maestro rhythm” MRQ-1 Model Drum Machine Synthesizer c. 1970, made in Lincolnwood, Illinois, serial #17583 , wood grained vinyl finish, wood, metal. Has built in speaker and 8 different thymic settings. Each setting can be varied in 3 ways: by Volume, by Balance, and by Tempo. Back has a 1?4 inch external amplifier output and a 1/4 inch Foot Swithc output. 50 watts, 115 volts, 60 hertz. Comes witha substantial length electric cord. Metalic plate at back is printed Maestro Sound Sytem. Patents Pending, Gibsoninc., Lincolnwood, ILL. Height is 7 1/2 in. (19 cm), 12 1/8 in. (30.8 cm.) width, and 9 5/8 in. (24.4 cm.) deep. Works great! Condtion 9 .great item for your collection” Auction ended. Click here to browse on eBay.