Cu-Ni 38.6mm diameter.  By Pobjoy Mint.  

ISLE OF MAN  ELIZABETH II. Her diademed, draped bust right.  R. 1952 · SILVER JUBILEE · 1977 · ONE CROWN ·  Three crowns around central triskelis. KM 41a. Proof-like. Slightly fingermarked, otherwise UNC.  In case of issue,

Depictions of coins are unretouched images of the actual item offered for sale.