Interesting!
I just got a sheet of the balls. I will use them on New Jersey cancel covers. At least the hockey stamps look like stamps, the ball stamps are round and look more like banana seals than stamps!
It was designed in Canada so maybe they wanted a more hometown feeling since hockey is more a past time for people than here. Here it is more spectator sport but not sure about northern US. The USPS may have just tagged along.
ice hockey vs. hockey is just like football and soccer. :-)
Football is the most popular sport in the world (and only called soccer in the US) whereas American Football is a sport that is hugely popular in the USA but considered extremely boring in the rest of the world (just my opinion, I really tried to watch a game when I was in the USA 2 years ago, but I gave up...)