Obverse:

ELIZAB D G ANG FR [ET HIB RE]GI. Crowned bust 6C l. with rose behind.

Reverse:

POSVI DEV ADIVTOREM MEV. Square topped shield over long cross fourchee dividing the legend. Date above.

Clipped otherwise fine, the reverse better, a very rare year. 

Ex W. Wilkinson Collection bt E. Smith, London Coin Fair Nov 1991