John, been on a business trip & away from computer. Thanks for correcting your post. I prefer all our posters to take the extra 2.5 seconds & write "Japanese" as the three letter abreviation is offensive to some especially without the "." !Your guage is a Japanese navy aviation compass. Used in larger aircraft & NOT from a zero or single seater. We Japanese collectors always joke that EVERYTHING airplane related is always from a zero! Send me an email if it's for sale.