Your friend made a very good purchase and if he spent under the $1000+ the bike is worth, he/she got a great deal. Could you show a closeup of the "coin brazed onto the top tube"? This sounds unusual.

You have read the serial number correctly. The bike is the 102nd Paramount made in September of 1972 and appears to be a P-15, which would have had Weinmann centerpulls as the original brakes.