If your number ends by 3, your ref number is good.
Welcome here, by the way, and congrats on this beautiful watch!
Any pics?
Best,
Nicolas
The 3 first numbers are reffering to the model of the watch, then the 4th number is used for the material of the case, the 5th for the bracelet or the strap, and the last numbers are for the color of the dial, or a random number.
Hope this will be of some help.
Nicolas
I'm not that old!
Just kidding!
Best,
Nicolas