In 1964, LEGO released 3 Classic Supplemental sets, all of these sets have been retired. For that year, the total price of all retail sets cost $3, today those sets are valued around $61, a growth of 2324%.
Most valuable 1964 LEGO Classic Supplemental set
799 Gray Baseplate $21.39
Highest growth 1964 Classic Supplemental set
401-3 Large Wheels with Axles +3888.00%
3 sets

401-3 Large Wheels with Axles

Theme / Subtheme Classic / Supplemental
Year 1964
Pieces 7
Availability Retired
401-3 LEGO Large Wheels with Axles
Retail $0.50
Value $19.94
Growth  +3888.0%
Annual growth 6.0%

402-2 White Turntables

Theme / Subtheme Classic / Supplemental
Year 1964
Pieces 5
Availability Retired
402-2 LEGO White Turntables
Retail $0.50
Value $19.28
Growth  +3756.0%
Annual growth 4.9%

799 Gray Baseplate

Theme / Subtheme Classic / Supplemental
Year 1964
Pieces 1
Availability Retired
799 LEGO Gray Baseplate
Retail $1.50
Value $21.39
Growth  +1326.0%
Annual growth 9.8%