In 1990, LEGO released 23 Basic sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Seasonal and Supplementaries.
Most valuable 1990 LEGO Basic set
735 Basic Building Set $384.26
Highest growth 1990 Basic set
1677 Rabbit +601.01%
Largest 1990 LEGO Basic set
1639 Basic Building Set 669 pieces
Most owned 1990 Basic set
715 Basic Building Set
23 sets

315 Basic Building Set

Theme Basic
Year 1990
Pieces 62
Availability Retired
315 LEGO Basic Building Set
Value $16.23

325 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 104 / 1
Availability Retired
325 LEGO Basic Building Set
Value $46.29

335 Basic Building Set

Theme Basic
Year 1990
Pieces 99
Availability Retired
335 LEGO Basic Building Set

365-2 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 337 / 1
Availability Retired
365-2 LEGO Basic Building Set
Value $93.14

385-2 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 438 / 2
Availability Retired
385-2 LEGO Basic Building Set
Value $79.96

395-2 Build-N-Store Chest

Theme Basic
Year 1990
Pieces 535
Availability Retired
395-2 LEGO Build-N-Store Chest

515 Basic Building Set

Theme Basic
Year 1990
Pieces 111
Availability Retired
515 LEGO Basic Building Set
Value $31.34

525 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 181 / 1
Availability Retired
525 LEGO Basic Building Set
Value $155.61

535 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 345 / 2
Availability Retired
535 LEGO Basic Building Set
Value $52.95

545 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 408 / 2
Availability Retired
545 LEGO Basic Building Set
Value $83.00

565-2 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 364 / 2
Availability Retired
565-2 LEGO Basic Building Set
Value $134.66

715 Basic Building Set

Theme Basic
Year 1990
Pieces 395
Availability Retired
715 LEGO Basic Building Set
Retail $17.99
Value $93.66
Growth  +420.6%
Annual growth 4.8%

725 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 319 / 2
Availability Retired
725 LEGO Basic Building Set
Value $237.07

735 Basic Building Set

Theme Basic
Year 1990
Pieces 537
Availability Retired
735 LEGO Basic Building Set
Value $384.26

818 Red Pull-Back Motor

Theme / Subtheme Basic / Supplementaries
Year 1990
Pieces 8
Availability Retired
818 LEGO Red Pull-Back Motor
Retail $12.25
Value $14.68
Growth  +19.8%
Annual growth 4.0%

821 Brick Separator, Grey

Theme / Subtheme Basic / Supplementaries
Year 1990
Pieces 1
Availability Retired
821 LEGO Brick Separator, Grey
Retail $2.25
Value $3.86
Growth  +71.6%
Annual growth 2.7%

1636 Handy Bucket of Bricks

Theme Basic
Year 1990
Pieces / Minifigs 184 / 1
Availability Retired
1636 LEGO Handy Bucket of Bricks

1637 Basic Building Set

Theme Basic
Year 1990
Pieces / Minifigs 491 / 2
Availability Retired
1637 LEGO Basic Building Set
Retail $22.00

1638 Basic Set

Theme Basic
Year 1990
Pieces 450
Availability Retired
1638 LEGO Basic Set

1639 Basic Building Set

Theme Basic
Year 1990
Pieces 669
Availability Retired
1639 LEGO Basic Building Set

1676 Basic Building Set

Theme Basic
Year 1990
Pieces 22
Availability Retired
1676 LEGO Basic Building Set
Value $25.24

1677 Rabbit

Theme / Subtheme Basic / Seasonal
Year 1990
Pieces 25
Availability Retired
1677 LEGO Rabbit
Retail $0.99
Value $6.94
Growth  +601.0%
Annual growth 5.2%

1679 Basic Building Set

Theme Basic
Year 1990
Pieces 43
Availability Retired
1679 LEGO Basic Building Set
Value $11.07