I have this 1979 Canadian cent and the reverse doubling of all four digits of 1979 are doubled and the pic for this reverse is on CoinsandCanada's website. I never really paid a tremendous amount of time to the portrait of Her Majesty on the obverse. There appears to be not only doubling on the back of her hair but also what appears to be a double hairline just below the Crown. It may be part of the design but it's the only one I have seen with this type of doubling. I hope my fellow variety collectors from Canada can help shed some light on this for me. The last pic was borrowed from coinsandcanada.