Which country are you referring to? A UK 1970 proof set (last of the pre-decimal issues) can be bought for around £15-20.
Pre retirement - 1970 TV is rated/received certificates of: Belgium:KT
It means just before the 1970's.
3 months
pre-accident value
Pre-1965 US quarters are 90% silver with a value of about $2.50 just for the silver.
It is impossible to say without knowing what country you're asking about.
Serial number
around 50 cents
500
In most cases the value is going to be based upon the value of the stamp itself. The pre-cancel may be of interest to specific collectors. Some collectors believe they de-value the stamp. Some experimental pre-cancels can be quite valuable.
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