Officers badges
Firstly I'm not a collector or by any means an expert.
The crown would put it between 1901 and 1953,
Now as for size, I believe that could vary depending on how accurate the taylor wished to be.
From 1856 to 1891 it was about 76·2mm wide and had increased to 85·7mm by 1938, during WWII all metal badges were worn.
The badge details are from Badges & Insignia of the British Armed Forces, The Royal Navy by Commander W. E. May
There are far more knowledgably people here who in time I'm sure will give a more detailed answer.
Hope it' some help.
Regards
WF
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