In 1980, LEGO released 2 Town Construction sets, all of these sets have been retired. For that year, the total price of all retail sets cost $10, today those sets are valued around $330, a growth of 3049%.
Most valuable 1980 LEGO Town Construction set
6678 Pneumatic Crane $199.99
2 sets

6648-2 Dump Truck

Theme / Subtheme Town / Construction
Year 1980
Pieces / Minifigs 42 / 1
Availability Retired
6648-2 LEGO Construction Dump Truck
Retail $4.49
Value $129.99
Growth  +2795.1%
Annual growth 7.0%

6678 Pneumatic Crane

Theme / Subtheme Town / Construction
Year 1980
Pieces / Minifigs 60 / 1
Availability Retired
6678 LEGO Construction Pneumatic Crane
Retail $5.99
Value $199.99
Growth  +3238.7%
Annual growth 5.8%