Civil War 4th Regiment Massachusetts Volunteer Militia Coat Button

Non dug gilted brass Massachusetts 4th Regiment Volunteer Militia coat button. The front has nice gold and detail. The hunting horn has the number 4 inside it, with Old English initials M V M above. The reverse has a c.1855, small depressed, R & W. ROBINSON * EXTRA RICH * backmark. The shank is straight. This button measures 23 mm in diameter. $295