System i Leg / Supplemental

Supplemental is a subtheme of System i Leg that consists of 68 sets that ran from 1955 to 1959. Most sets were released in 1958 which accounted for 24 sets. As of today, the average annual growth of all the sets in System i Leg Supplemental is around 5.8% per year. As with most sets produced in this subtheme, finding such sets in new/factory sealed condition is pretty difficult contributing to their overall value. As of today, 214-4 Windows and Doors Retailer Pack is the most valuable set in System i Leg Supplemental with an estimated new/factory sealed value of $741.51.

Most valuable LEGO Supplemental set
214-4 Windows and Doors Retailer Pack - $741.51

Most valuable retail System i Leg set
231-2 Esso Pumps and Sign - $275.08

Largest LEGO Supplemental set
234 Letter Bricks - 50 pieces

Most owned Supplemental set
223-2 1x1 Round Bricks

Starting in the 1950s LEGO began individual parts sales, a practice that began with the Ferguson Tracktor in 1951. LEGO would supply dealers with wooden parts boxes and refill packs. These individual part sales would continue, at least in some markets, into the late 1950’s.