The answer to your question is unfortunately very little or nothing. You may be lucky to even give them away
A 1971 basketball set would most likely be worth $185 american. By: Amitoj Rehill Calgary,Alberta, Canada
A Proof set is $8.00 & a Mint set is $5.00
As of 11/2008 a set of uncirculated 1971 U.S. coins retails for about $9.
Current average retail value is $5.00. Issue price was $3.50.
Average retail value is $7.00 Issue price was $5.00
Current retail value is $8.00. Issue price was $5.00.
According to USA Coin Book, Philadelphia, Denver and San Francisco Mint each came out with their own Mint Sets. As of 2010, each set is worth about $5.50.
encylopedia
The Pet Set - 1971 1971-06-21 was released on: USA: 21 June 1971
you don't
$30 new was how much it was worth new when first published in 1993. Its not particularily valuable like say The Concordance. (that fetches hundreds if not thousand)
They are not silver. Kennedy half dollars stopped being silver in 1970, all 1971 dated coins are copper-nickel and only worth 50 cents. There wasn't even a 1971 half dollar in silver for collectors. All 1971 half dollars are worth only 50 cents unless in a mint set.