Blue Box was founded
in Hong-Kong in 1952 by Peter Chan Pui to manufacture toys. Subsequently
factories were established in Singapore and Macao. In the 1980s
manufacture was transferred to China, although the siege remained
in Hong-Kong. The company still operates today employing 7,000 people
Blue Box designed an interesting
LEGO clone at an undeterminate date, manufacturing it at its Singapore
factory. The style of the box graphics points to a late 1960s or
early 1970s date and the production may have ranged both decades.
Blue Box's construction system
is quite ingenious in that the bricks are flexible and have underside
pins that fit into stud holes giving the most positive connection
I have seen with the exception of RASTI.
All LEGO bricks interlock firmly with Blue Box's from the top but
the opposite is not feasible since the studs of LEGO do not have
the holes needed to accomodate the pins.