Massachusetts had not minted any coins since Hull & Saunderson closed its mint in 1682.
Paul Revere was the engraver of this coin in 1776, which never reached circulation. An original coin was sold in 1979 for $40,000.00, which now would be worth a lot more. Some say this coin is named after the Mythical God, Janus who had 2 heads one looking towards the old year and one towards the New Year, the month of January is named after him. Or some say that it was meant for the Whigs & the Tories.
On the obverse it shows 3 heads looking forward, left & right with the STATE OF MASS ½ D. The reverse has a Seated Liberty with the legend GODDESS LIBERTY & 1776.