LEGO → System → Service Packs |
39 Motor Gearbox was a System Service Packs set released in 1977. It contained an OldGray 12 x 4 x 3 1/3 electric 4.5V/12V type II motor gearbox (Part x469bc). It is the same as 1234 Replacement Gearbox for Electric, Motor 4.5V/12V and 6213 Gear Works Assembly.