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From what I can see the markings are "No 501 I N B Ltd 10/43"
"No. 501 I" - Self explanatory to an extent Number 501 fuze Mark 1
"N" - Naval service
"B Ltd" - The manufacturer. There are a number of candidates for this, but I strongly suspect it is Bryces Ltd of Hackbridge, Surrey who, as part of the war effort made fuzes.
"10/43" Date of manufacture.
Your fuze appears to be missing a filling station mark and date, suggesting it was not filled.
For the information on the markings. I have several, and I mean several, pics of different fuzes and other items I will be posting for everyones enjoyment.
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