Interesting Japanese collar insignia. It took me a while to figure out exactly what this was but finally found it in my Nakata book. Of course I am not sure if my translation is perfectly accurate but it seems to be collar insignia for cadets at officer training school and would go along with the usual rectangular rank insignia with stripes and stars. I was not able to find any similar examples offered for sale. Nice bullion wreath with metal star affixed in center. Apparently a scarce item.