The 1917 LPs relate to legal titles, not styles; otherwise Maud, the queen of Norway, would have had to be styled HRH Princess Maud when she was in the UK.
The issue of styles and titles in the case of dynastic marriages is complicated and, as I said, I don't fully understand it.
After getting married Princess Maud was referred to in the UK as HRH Princess Charles of Denmark even though she was still technically HRH Princess Maud in her own right. Of course, later, she became HM The Queen of Norway.
Princess Marina, who was also a princess in her own right, but in this case a foreign one, became only HRH The Duchess of Kent upon marriage. She was later known as HRH Princess Marina, Duchess of Kent by special dispensation of the British monarch and not by virtue of having been born a princess in her own right.
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