Unusual 5514 Comex case back

[Comex1665]

Hi guys,
I just wanted to ask you guys if this case back has been released by Rolex for Comex or it is an aftermarket/ fake one.

[IMG]http://tapatalk.imageshack.com/v2/360x360q90/14/11/16/8352c0f4e3abee6d8e1dd5bfa5ff3646.jpg[/IMG

]I have never saw a 5514 Comex using this type of case back.
I know that the early and first 5514 batch used this one (little numbers)


Then the second batch (middle numbers)


And the most by appreciated by most of 5514 Comex enthusiast, the latest 5514 batch with big numbers:


Maybe our friend Marcelo will clear this up.

Thanks folks !