It's a medal, not a coin. The coloured bits on the shield are enamelling, and that's how the medal was originally issued.
This website has another one, with its loop still attached; yours presumably had one at some stage too.
Googling the exact phrase "Toronto old boys at home" comes up with four hits, all of which (except for the one I linked to above) are examples of this medal being sold on
ebay or Kijiji. So I'm afraid I can't tell you much about who they were, since these medals seem to be the only surviving evidence for their existence.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis