I copied this description from Calgary Coin and Antique. This is a go to website fpr Canadian coins.
1910 Victorian leaf 50 Cent
Earlier examples of the 1910 half dollars have a reverse with what is known as the Victorian leaves design which had been in use since the first issues of 1870. The leaves to either side of the date are more pointed and slightly elongated so that they end closer to the denticles, but a distinctive feature is very narrow rims which is clear even on worn examples. These are the scarcer of the two types.
1910 Edwardian leaf 50 Cent
Later in 1910 the reverse was redesigned to what is known as the Edwardian leaves type, where the leaves to either side of the dates are more rounded and slightly shorted so they end further from the rim, and at the same time the rims were made wider. On worn examples they are most easily differentiated by the rim width.