In 1968, LEGO released 3 Classic Building sets, all of these sets have been retired. For that year, the total price of all retail sets cost $23, today those sets are valued around $1,544, a growth of 6498%.
Most valuable 1968 LEGO Classic Building set
341 Warehouse $587.98
Highest growth 1968 Classic Building set
340-3 Railroad Control Tower +11106.33%
Largest 1968 LEGO Classic Building set
342 Station 215 pieces
3 sets

340-3 Railroad Control Tower

Theme / Subtheme Classic / Building
Year 1968
Pieces 86
Availability Retired
340-3 LEGO Railroad Control Tower
Retail $4.90
Value $549.11
Growth  +11106.3%
Annual growth 8.6%

341 Warehouse

Theme / Subtheme Classic / Building
Year 1968
Pieces 123
Availability Retired
341 LEGO Warehouse
Retail $7.25
Value $587.98
Growth  +8010.1%
Annual growth 8.0%

342 Station

Theme / Subtheme Classic / Building
Year 1968
Pieces 215
Availability Retired
342 LEGO Station
Retail $11.25
Value $406.77
Growth  +3515.7%
Annual growth 6.5%