Which country are you referring to? A UK 1970 proof set (last of the pre-decimal issues) can be bought for around £15-20.
Currently, the retail value is about $9.
What is value of proof set of Commonwealth of the Bahams proof set 1974
The current value of a 1950 proof set is $750.
The current value of a 1962 US proof set is $29.
The value of the set is dependent on condition. However, the proof set value is between $50 and $70 US.
As of 12/2008, Numismedia quotes the fair market value (FMV) at $13.00
1976 bicentennial proof set silver dollar half and quarter what's the value of this uncirculated set?
A 1988 proof set has a retail value of $8.00 issue price was $11.00
The current average value of a 1962 US proof set is $29.
The 5 coin proof set has a value of $6, the 10 coin set has a value of $15 and the 10 coin silver set has a value of $48.
11-8-11>> The current value of a 1962 US proof set is $30.