hi!
i`m not quite an expert, but i have never seen such a style, so maybe it´s something someone made up?
on the other hand, chanel items always have item numbers starting with an a and a 5-digit-number...so that be the a34299, followed by the material code y01480 (although it`s usually y and then only 4 digits)
so i`d suggest you to contact one of the london chanel boutiques or the gb customer service and aks for that item number!