Serial Number on Leupold Optics

[SDS14]

Do you guys know where I can find the Serial Number on a pair of Leupold Mojave Proguide HD 10x42 Binoculars? I am trying to register my binoculars on Leupolds Website. Thanks for your help.
-SDS14

 

[Frenchy]

Typically on the center "pivot" portion on the front. Not sure how to describe it.