When the LV spring catalog from Eluxury came out for the Cerises Speedy, it was misprinted - had a picture of a Speedy 25 and a pochette, but the item description said it was a speedy size 30. This caused the "replica" manufacturers to make this bag in a 30 (not always, but there were many). I still have this old catalog with the misprint and I'll try to take a picture of that particular page with the error. It's possible that it's not an error and LV at one time planned to make the bag a 30 instead of a 25 then the plan changed?
