Orient MS. DIVER Serie Manual De Instrucciones página 6

HOW TO IDENTIFY THE CALIBER NUMBER
Check the caliber number by referring to the model number of your watch or
the case code on the watch's case back.
1. Searching by 10-digit model number
Check the 10-digit model number on the guarantee supplied with your watch.
You can also see the number on the product tag put on the watch. Its second
and third digits indicate the caliber number of your watch.
Example: If the model number is " UNA5007B ", the caliber number is
"UN".
2. Searching by the case code
See the case code on the case back of your watch.
The first two digits indicate the caliber number.
Example : When the case code is "UNA5-D0", the caliber number is "UN".
* The place of case code may vary and its letter size may be small and
difficult to see depending on the characteristics of watches.
* The pictures and illustrations on this manual may differ from the actual
appearance of your watch but the function and operation procedures are
the same.
6
Case code