LEGO 404 Building Set is a vintage Universal Building Set set from 1977 valued at $403 for new and sealed sets, up 907% from an original retail price of $39.99. Annual appreciation has averaged 4.86% since release. Used copies are valued between $280 and $385 depending on condition.
LEGO 404-1 Building Set is a Universal Building Set/Basic Set released in 1977, containing 467 pieces and 3 LEGOLAND figures. It was a U.S.-exclusive release and is equivalent to set 912 Universal Building Set / Advanced Basic Set with Motor. The assortment includes black, red, yellow, blue, light gray, and trans-clear elements such as bricks, plates, slopes, wheels, hinges, rubber bands, and string, plus a black 4.5V battery box compatible with 1-prong and 2-prong connectors. Notable parts include a black Technic link chain with 48 studded links and a yellow crane bucket with a spring mechanism, and the figures appear in blue and white color schemes.
A new and sealed Building Set is currently valued at around $403, with annual growth of approximately 5%. The average used price is $334 for those in good overall condition. Based on current trends, this set could be valued near $422 within the next year.