Earlier today, I decided to check the back sides of the zippers on my RGGH Day (for the first time ever), and saw that they're all smooth as well (no Lampo stamps). I even took out a magnifying glass to see if I was missing a smaller logo somewhere, but nothing. I have to say that since this is my very first Balenciaga bag, I kinda panicked. I thought, oh no...I was duped...maybe the store where I got it had a counterfeit bag that they sold me...oh no...but, wait, the leather on this bag is so smooshy and soft and everything else is perfect and I love it...oh my gosh...what happened? You see, I did panic. Then I thought, hey let's see if there's anything about this on the Purse Forum. And here we are. Boy, I sure am happy to see that this (the Lampo stamp) appears to be something that is missing from other giant rose gold hardware bag zippers as well. Phweeuff.