I don't have any firm ideas about that 992234177. All that I am sure about is that the modern photo of the tiara does not fully match with the tiara as seen in the photos of the two earlier Sultanas. I wish I could find high quality photos of the tiara as worn in the earlier period -- or some reliable information that the tiara was modified at some stage.
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I wonder if the tiara image is actually a photograph. There is something a bit off about it, a bit too perfect and even for it to be real.