Hmm, well it looks like I'm gonna throw a cat amongst the pigeons here because my Giant City in RGH turned up today and it does have Lampo stamped on the back of all the zips. Ordered direct from the Balenciaga UK website so absolutely authentic, ordered on the 27th. Perhaps their Rose Gold zippers are now manufactured by Lampo but the earlier ones weren't?
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Yes, what year is yours? Maybe they just started that? Off to check mine...