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I could be wrong but it seems the practice at the time was only to stamp the MK and not the number.................
Examples are:
1) British No 56 Mk IV fuses - only ever marked "IV"
2) British No 63 Mk I fuses - only ever marked "I"
3) British No 60 Mk I & II fuses - only ever marked "I" (ie like in your photo) and "II"
Having stated the above, I have examples of conversions where the No is stamped in addition to the MK (ie "60c) - {search BOCN on some of my posts on this}
I also have from memory a No 63 which was stamped on top and the later No 65s all appear to be stamped on the top nut.
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