LEGO 103 4.5V Motor Set with Rubber Tracks is a vintage Universal Building Set set from 1969 valued at $166 for new and sealed sets, up 2191% from an original retail price of $7.25. Annual appreciation has averaged 5.65% since release. Used copies are valued between $31 and $44 depending on condition.
LEGO 103-1 4.5V Motor Set with Rubber Tracks is a Universal Building Set Supplemental set released in 1969, containing 32 pieces. The set includes a 4.5V Type B electric motor, a 4.5V battery box, wiring, wheels, rubber treads, and a modified plate with a motor cutout, providing parts for motorized vehicle and train applications. It is compatible with the early LEGO 4.5V train system, and the motor and battery box were produced in versions for 1-prong and 2-prong connectors. An informational booklet titled Facts about the new Lego Battery-motor was also included, and the set has a parts selection similar to set 900 Universal Motor Set.
A new and sealed 4.5V Motor Set with Rubber Tracks is currently valued at around $166, with annual growth of approximately 4%. The average used price is $37 for those in good overall condition. Based on current trends, this set could be valued near $176 within the next year.