Rock-Ola 21000 (1935)
Manufacturer: Rock-ola Manufacturing Corporation, of Chicago, Illinois, USA (1932-1938)
Type: Electro-mechanical (EM)
Theme: Skillshot
Specialty: Flipperless
Notable Features: A solenoid kicker above the bottom Free Play hole kicks the ball back into play. The factory power supply was 6-volt battery. The backbox measures 15 5/8 by 15 1/2 by 2 5/8 inches.
Design by: David Rockola
Notes: This game was originally produced as Rock-ola's 1935 '21', and is the same game but with higher score values.
Source: IPDB