1944 Photo with Smith, King and Nimitz on eBay

Is the USMC serial number on the side normal? I don't remember seeing that in other photos.

"Original WWII press photo of US Marine Lt. General Holland Smith, Commanding Amphibious Assault Troops in Pacific (standing) showing US Fleet C-in-C Admiral Ernest King and Admiral C. W. Nimitz (seated in jeep) aroung on Saipan, 7-24-1944."

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