Origin of this contrast, please

WhatsApp Image 2024-02-15 at 13.45.50

Hello, does anyone know the origin of this contrast, please? Thanks

The Diana head mark looks like the Austro-Hungarian mark for 900 standard silver from 1867 onwards (see here), but I have doubts if only because of the 925/000 and sterling marks which suggest a higher standard. Also the reference doesn’t list a town for the O part of the Diana mark.

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Understood, thank you very much Phil