Question: What material is made with a Rounded, plain edge?
SQL: SELECT "Composition" FROM "1-1307572-1" WHERE "Edge" = 'Rounded, plain';

Question: How many coins have a diameter of 23mm?
SQL: SELECT COUNT("Reverse") FROM "1-1307572-1" WHERE "Diameter" = '23mm';

Question: When was the coin with the mass of 3.7 g first minted?
SQL: SELECT "first minting" FROM "1-1307572-1" WHERE "Mass" = '3.7 g';