Four buttons. Two buttons have a rope twisted rope edge. On a smooth background is a pre-1901 crown with a fouled anchor below it. On the left-hand side of the anchor stock is a R, on top of the shank is an N and to the right of the stock is a R.
One of the buttons has a twisted rope edge. Within a circle on a lined background is a pre-1901 crown above an anchor. On a belt around the anchor is COAST GUARD.
One button has a smooth edge. Within a raised circular border on a lined background is a post-1901 crown above an anchor where the rope appears from under the right-hand stock, over the shank to the left and then under the shank to the right and finishes under the right arm. Petty officer.