Need help - have this Pakistan 1 Rupee 1987 in collection with a unique error . The reverse has the Year stamped in reverse below the design . It is quite evident that the reverse has been stamped over it . But my curiosity is why did it not take the rest of the obverse elements - just the year . Secondly the reverse year is die rotational as compared to the obverse. Appreciate expert inputs. Does it make it a rarity or a common error.

