I acquired a Hay-Budden, 204#, some months back and have tried to do some research, but can't find another one like it. It has three holes instead of two, the squared portion at the base of the horn only goes half-way, not all the way across. It does not have a serial number at the front under the horn like others, but does have 069 stamped on the side of the tail opposite the manufacturers stamp. Does anyone have a clue?