Congrats on the purchases!
The 1972 bronze medal was sold two ways: as part of a philatelic-numismatic cover (PNC) and individually in a black plastic case. You can always tell the difference between the two by checking the medal for a date. Those sold in the PNC were not dated, those sold in the plastic case were. Your dated example appears to be in its original case â€" always a plus!
These medals were sponsored by American Revolution Bicentennial Administration (ARBA) and were struck by the US Mint. The ARBA medals were issued between 1972 and 1976; the bronze medals were available individually cased for $3.50 and in the PNC for $5.00. Beginning in 1973, the medals were also available in sterling silver. Taken all together, the medals make for an attractive set.
Washington was featured on the obverse of the medals in 1972, Patrick Henry and Samuel Adams in 1973, John Adams in 1974, Paul Revere in 1975 and Thomas Jefferson in 1976.
The final sales totals for the Washington medal you've shown include over 670,000 examples in cases and over 895,000 medals in PNCs. Definitely not a modern-day rarity, but that doesn't take anything away from the attractive design or historical importance!
Collecting history one coin or medal at a time! (c) commems. All rights reserved.