CREATE TABLE table_17976 ("Value" TEXT, "Diameter" TEXT, "Thickness" TEXT, "Mass" TEXT, "Composition" TEXT, "Edge" TEXT, "Obverse" TEXT, "Reverse" TEXT, "first minting" FLOAT, "issue" TEXT, "withdrawal" TEXT, "lapse" TEXT)

When was the coin with the mass of 3.7 g first minted?
SELECT "first minting" FROM table_17976 WHERE "Mass" = '3.7 g'
SELECT "first minting" FROM "table_17976" WHERE "Mass" = '3.7 g'