Die clashes. With that obverse you can find them in every year from 1953 to 1964. Lots of minor clash variations, even double, and triple clashes. Some years are harder to find than others, but 1961-1963 are the most common.
"Research is what I am doing, when I don't know what I am doing" --Wernher von Braun
The hanging numbers are always fun to find even though they are common. I enjoy finding them as well, like SPP-Ottawa stated, they are fairly common from 1953 to 1964 but sometimes you can find them in earlier years like the 1937 I found a few months back shown below.
If you look at a lot of 1953's you will also find some really deep hanging 3's from time to time, this one shown here that I found you can catch a fingernail off of it.
There is also this 1962 that I also enjoy, you might not be able to see it due to the clarity of the photo, but it is actually a quad hanging 2 (4 clashes)
I like your photos and the hanging numbers are very fun to find, I know you are new here but I would also like to add for future reference when you post you should always include the Year, Denomination and origin (Canada,US, Ect) in your title so that others know which coins you are posting and will be able to help you further.
They say coin roll hunting is like a box of chocolates, you never know what your gonna get.... I think it went something like that, I was too busy looking at coins.
This is my very first error coin I found that got me hooked. - 1989 Belize 25 Cent's with a Doubled Die Reverse http://goccf.com/t/362747