Sterling silver 38.6mm diameter, 28.6gm.  By Pobjoy Mint.  PROOF 4 standard.

ISLE OF MAN  ELIZABETH II Her diademed, draped bust right. Mintmark PM below.  R. 1953 · 25th ANNIVERSARY OF THE CORONATION · 1978 · ONE CROWN · Two peregrine falcons. KM 43a.  Almost FDC.  In case of issue, with certificate. The yellow colour is of the protective plastic shell, not the coin.

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