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 $1,716, a growth of 7234%.
Most valuable 1968 LEGO Classic Building set
341 Warehouse $671.09
Highest growth 1968 Classic Building set
340-3 Railroad Control Tower +11651.02%
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 $575.80
Growth  +11651.0%
Annual growth 8.6%

341 Warehouse

Theme / Subtheme Classic / Building
Year 1968
Pieces 123
Availability Retired
341 LEGO Warehouse
Retail $7.25
Value $671.09
Growth  +9156.4%
Annual growth 8.1%

342 Station

Theme / Subtheme Classic / Building
Year 1968
Pieces 215
Availability Retired
342 LEGO Station
Retail $11.25
Value $469.23
Growth  +4070.9%
Annual growth 6.6%