Check your VIN, it'll be on there, for example on my FC the VIN starts as JM1FC. J stands for Japan, M1 is Mazda, FC is the platform. Taking a look at my VIN on my ownership, JM1DE1H, the chassis code would be DE. If the coding is similar to what it used to be, the 7th last digit (0) signifies it was made at the Hiroshima plant.