In 1988, LEGO released 2 Basic Universal Building Set sets, all of these sets have been retired.
Most valuable 1988 LEGO Basic Universal Building Set set
1495 Basic Building Set Trial Size $23.51
Highest growth 1988 Universal Building Set set
1514 Basic Building Set Trial Size +702.81%
2 sets

1495 Basic Building Set Trial Size

Theme / Subtheme Basic / Universal Building Set
Year 1988
Pieces 26
Availability Retired
1495 LEGO Basic Building Set Trial Size
Value $23.51

1514 Basic Building Set Trial Size

Theme / Subtheme Basic / Universal Building Set
Year 1988
Pieces 46
Availability Retired
1514 LEGO Basic Building Set Trial Size
Retail $2.49
Value $19.99
Growth  +702.8%
Annual growth 6.9%