When was the coin with the mass of 3.7 g first minted?
CREATE TABLE table_1307572_1 (first_minting VARCHAR, mass VARCHAR)
SELECT first_minting FROM table_1307572_1 WHERE mass = "3.7 g"
### Context: CREATE TABLE table_1307572_1 (first_minting VARCHAR, mass VARCHAR) ### Question: When was the coin with the mass of 3.7 g first minted? ### Answer: SELECT first_minting FROM table_1307572_1 WHERE mass = "3.7 g"