I've always assumed these were crown tops but I'm not 100% sure, I don't remember ever seeing a picture of a full one. Not something we ever had in Canada. I think there was a wide-mouth version of these with some sort of thin aluminum cap that you peeled off as well, so possibly could have been something like that too.Actually kind of found it by accident, as it was one of the few that was completely buried, just beside those couple of stubby amber beer bottles, that were partially buried. Paw in law says they're Jax, or maybe Jack's, beer bottles. If you notice, one of the stubbies has a different closure, of which I am uncertain of it's name?? I'm assuming it was just a pry off cap, but unlike a crown top: