This was discussed earlier - I can't remember where and when - and a few examples were given. It got me going on a search for a nice 1896 Patt KLR with three loops - alas without success (yet) !
I do have an officer's one with three loops - and there is one with three blades too.
Anyway, I have a feeling that in the earlier thread there was mention of it being related to the FSH.
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