I have both the CherryPickers Guide,(5th addition), and the Red Book open, (2015 addition), and they are showing differences of what the Proof 'S' type I & II MM are supposed to look like. (specifically the quarter)
Which year, 1979 or 1981? The 1979 mintmark is quite easy to determine while the 1981 differences are more subtle. It is also worth noting that the 1979-S Type 2 mintmark is the same mintmark as the 1981-S Type 1.
For that coin/yr. you have either the clear S or the filled S The clear is worth about twice as much as the filled. Compare with both books and you will find out if one or the other is mistaken. Or not :)
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use