Navitimer 806 issued to Iraqi Air Force - serial numbers?

Hi,

I am wondering if all the Navitimers 806 issued to the Iraqi Air Forces should have a serial number inscribed in the inside of the case back or not. They typically have an Iraqi air force logo on the dial and something similar inscribed in the case back, but no 806.

I am showing here two examples. First one shows a serial number and the second one doesn't.

Do you think the second one had the case back replaced? By replaced, I mean by other than Breitling or the Iraqi Army.

Thanks