27th July 1944 A.M.O.N. 775 describes how the frog is reversed and folded over to tighten the loop for the No4 frog, this was amended in 1944 A.M.O.N 988 this was for RAF, for army it was No375 1944 for Army, it shortened the frog but removed any needs for re stitching of the frog to fix the No4 scabbard, there were earlier amendments that had slits stitched in the top loop to take the No4 frog stud. If you have a copy of Carter it is No154, if you wait till towards the end of next year it could be ion VolIII of my books on frogs.

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Note this actually results in the loops beign upside down, with the belt loop passing through the top loop and exiting the bottom one.