If you are interested by "hangers", they can only be found between 1953 and 1964, as the jaw and throat of the queen making the mark only coincide to the last digit of the date for those years. I have found them single, double, triple or quadruple. Here's an exhaustive list, the number in parenthesis tells you if I found single, double etc.
1953nsf(1,2,3), 1953sf(1,2), 1954(1,2,3), 1955, 1956, 1957(1,2,3), 1958(1,5), 1959(1,5), 1960, 1961(1,2), 1962(1,2,4), 1963(1,2,3), 1964(1,4)
Now that's just for "hanging". As I collect die clashes, I also have coins that don't have the hanging but will have the date in the throat of the queen, the maple leaf on the back of the neck, etc.
I agree with SPP, a single hanging mark doesn't call for much of a premium, but double or more is a little harder to find (for some years) and might be worth a little more.