Wow, well spotted mate!
I was nearly going to say that there was another typo on the month's name, written "
Juny" (since June in spanish is written "
Junio") but a quick search on the internet showed me that this is the archaic form of the month's name in spanish. I am glad I searched before making the fool of myself!
Anyway, I agree it's wonderful that we can look into these details and comment nowadays, and I wonder if anyone actually noticed that when it was first published.