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No. 375 is not evenly divisible by nine.
No. 375 is divisible by 1, 3, 5, 15, 25, 75, 125, 375.
It means it is 9 carat gold assayed in Birmingham, England. The F denotes which year it was hallmarked - depending on the style of the F you can work out the year.
0.4167
C = 5/9(f-32) c = 5/9(375-32) c = 5/9(343) = 190.5c