Is this Luminor Marina fake?

[Obi Wan]

Hello there!

I have been offered a Panerai Luminor Marina from a business which was closed many time ago with a lot of gadgets inside, including some old watches. It is not in my hands, just received some pics.
Price would be almost symbolic so IMO worth it to check its authenticity. On the one hand, the weird circumstances tell me that it would be odd that this watch should not be authentic but having a look at the photos and diving into the Internet, I do not find this exactly model, with a transparent case. I am affraid it is a fake: I do not see the serial number or model and just has “Swiss” instead of “L Swiss L” or “Swiss Made” under 6 number.

Do any of you help me to check if indeed it is a fake? Or, contrary to my belief, it could be authentic?

Thank you very much and kind regards.