In 1976, LEGO released 14 Basic sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Model and Supplementaries. For that year, the total price of all retail sets cost $205, today those sets are valued around $3,747.
Most valuable 1976 LEGO Basic set
911 Advanced Basic Set $576.77
Highest growth 1976 Basic set
Weetabix House 2 +10307.20%
Largest 1976 LEGO Basic set
912 Advanced Basic Set with Motor 471 pieces
Most owned 1976 Basic set
107 Universal Motor
14 sets

10 Basic Building Set

Theme Basic
Year 1976
Pieces 152
Availability Retired
10 LEGO Basic Building Set
Retail $9.75
Value $224.85
Growth  +2206.2%
Annual growth 6.5%

20 Basic Building Set

Theme Basic
Year 1976
Pieces 217
Availability Retired
20 LEGO Basic Building Set
Retail $12.99
Value $87.08
Growth  +570.4%
Annual growth 3.8%

30 Basic Building Set

Theme Basic
Year 1976
Pieces 258
Availability Retired
30 LEGO Basic Building Set
Retail $19.99
Value $197.72
Growth  +889.1%
Annual growth 6.4%

40 Basic Building Set

Theme Basic
Year 1976
Pieces 258
Availability Retired
40 LEGO Basic Building Set
Retail $16.99
Value $251.92
Growth  +1382.8%
Annual growth 5.5%

50 Basic Building Set

Theme Basic
Year 1976
Pieces 390
Availability Retired
50 LEGO Basic Building Set
Retail $19.99
Value $565.31
Growth  +2728.0%
Annual growth 6.9%

107 Universal Motor

Theme / Subtheme Basic / Supplementaries
Year 1976
Pieces 137
Availability Retired
107 LEGO Universal Motor
Retail $24.75
Value $143.45
Growth  +479.6%
Annual growth 3.8%

108 Battery box

Theme Basic
Year 1976
Pieces 1
Availability Retired
108 LEGO Battery box
Retail $4.00
Value $200.00
Growth  +4900.0%
Annual growth 8.5%

616 Cargo Ship

Theme / Subtheme Basic / Model
Year 1976
Pieces 31
Availability Retired
616 LEGO Model Cargo Ship
Retail $3.75
Value $69.25
Growth  +1746.7%
Annual growth 5.1%

910 Advanced Basic Set

Theme Basic
Year 1976
Pieces / Minifigs 283 / 3
Availability Retired
910 LEGO Advanced Basic Set
Retail $22.99
Value $482.32
Growth  +1998.0%
Annual growth 6.3%

911 Advanced Basic Set

Theme Basic
Year 1976
Pieces / Minifigs 401 / 4
Availability Retired
911 LEGO Advanced Basic Set
Retail $24.99
Value $576.77
Growth  +2208.0%
Annual growth 6.5%

912 Advanced Basic Set with Motor

Theme Basic
Year 1976
Pieces / Minifigs 471 / 3
Availability Retired
912 LEGO Advanced Basic Set with Motor
Retail $36.99
Value $460.22
Growth  +1144.2%
Annual growth 5.2%

Weetabix Windmill

Theme Basic
Year 1976
Pieces / Minifigs 119 / 2
Availability Retired
LEGO Weetabix Windmill
Retail $2.50
Value $227.82
Growth  +9012.8%
Annual growth 9.5%

Weetabix House 2

Theme Basic
Year 1976
Pieces / Minifigs 140 / 2
Availability Retired
LEGO Weetabix House 2
Retail $2.50
Value $260.18
Growth  +10307.2%
Annual growth 6.8%

Weetabix House 1

Theme Basic
Year 1976
Pieces / Minifigs 143 / 1
Availability Retired
LEGO Weetabix House 1
Retail $2.50