Hello, I have a 1970 PAN AM NEW ERA OF FLIGHT 747 SAN FRANCISCO INTERNATIONAL AIRPORT "THE AIRPORT CITY" SAN BRUNO, CALIFORNIA bronze medallion. Anyone know the story behind it? I know 1970 was the year the 747 started flying commercially and that there is one of these displayed at the aero museum at the SFO airport, but that's it. Any insight would be greatly appreciated. Thanks!

