I'm only guessing based on the few English pieces I have with any sort of ID on them, always on the base. Other countries ideas might have been different? I have a pair of French vases with "Made in France" etched onto the body of the vase above the base.
Something else I notice, here again (in the set you spotted) we have a powder pot, a perfume flask and an atomiser. Some time back, I submitted photos of a part Hermanova set number 11602 consisting of a tray, powder pot and candlesticks. They were allocated to two separate pages as, in the catalogue, they were shown as two sets. Pot, flask and atomiser 11350 - 18659 and tray, candlesticks and pot as 18698 - 18700.
I've also wondered why, when trying to make sense of the Buder catalogue, the comb trays are sometimes quite different in appearance to the pot, flask and atomiser they apparently go with and why these four items are shown separated from larger trays, candlesticks, and pin dishes that are all so similar that without the catalogue to confuse the issue, they would be regarded as "standard" sets with tray, pots, candlesticks etc.
Could it be that in the Buder sets shown in the 1960 catalogue we don't have pot, flask, atomiser and comb tray, but the three items with a tray to stand them on? As with the Hermanova sets 11350 - 11602. A bigger picture that might, in itself, help ID some Mysteries? As for whatever reason it was common practice at the time to show them as two sets.