The same tiara worn by Princess Caroline-Mathilde of Denmark (mother of Count Ingolf, Princess Elisabeth and Count Christian). The shape of the central "prong" looks different than in the version worn by Countess Anne-Dorte:
I have also read (but I do not remember where) that, on the following picture, Princess Caroline-Mathilde is wearing the sapphire and diamond clusters of the tiara mounted as separate elements on her necklace (her tiara is the one currently in the possession of her daughter Princess Elisabeth):