With the April 2013 update, the NGC US Coin Price Guide now includes more than 50,000 values for plus grades. ‚ÄúThis is an important step in our continuing mission to provide collectors and dealers wit. Q: My brother has silver coins from the 16th to 18th centuries, but no idea where to go to have them appraised. What is value on these? A: We get a lot of queries about…