What's the value of 1970's 50 cent pieces

This is a 40% silver coin. The U.S. mint in San Francisco made them in proof sets which would have an S mint mark. They were also only made for mint sets at the Denver mint. None were made for circulation. PCGS value guide (www.pcgs.com) show values that range from $5.00 up. The melt value of the silver is $2.28. I have found that Southern California Stamp & Coins are fair and honest and a pleasure thilo deal with. They even give free appraisals.

Depending on the condition. It can be 50 cent to about $50 although if you are lucky to get one in ms-67 or up it could be anywhere from 300 to over $1,000. PCGS has a $5,000 price tag on ms-68 but good luck getting that not just ms68 but the five grand.