My friend Alex (lexy-bell.tumblr.com) just pointed this out to me:
Vault 713 is the vault in Gringotts where The Philosopher's Stone (SUCK IT AMERICANS!) was held.
Harry's Birthday is the 31st of July, the 7th Month. 31/7 (Once again, SUCK IT AMERICANS!)
713 is Harry's Birthday, backwards.
31/7 > 713
mind = blown.










