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ObiWomKenobi
As others have said it will be the lug to lug measurement that matters most. The PO 39.5 has a remarkably small L2L - i think just below 45mm - so will wear well better than you think on smaller wrists. The seamaster 300 has I think a 50mm L2L so will wear much, much bigger.
I think my wrists might be similar size to yours (maybe bit bigger) - here's the 39.5 PO when I tried it on if it helps...
[now adding photo - something went wrong before...]