I agree with what Berkley says, the nail holes would have been for the general housing on the kukri, which the frogs (if they were used on this kukri), would have fitted over the top.
I wonder if this kukri didn't belong to an ex Gurkha hence the ridge for the frog on his scabbard, and the possiblity of frog carry, with the ex Gurha wearing a more western style of dress, which was bought or given to a Westerner in Nepal May 1965, and then found its way to Guernsey, and onto you Richard
