Listed as having a “French Kissing Insert.”

 

wtf? I have no idea what that means

 

I’m right there with you, but I’d guess it’s a different take to the “kissing 40” insert where part of the “4” touches the “0” ?

 

Maybe the owner is French as it is clearly a "kissing 40" bezel insert which are quite rare and valuable.
See image for comparison to other inserts without the "french kissing insert".

 

It's a bezel insert whose beauty can only be fully appreciated through licking.

 

I'm pretty sure the names are meant for nothing more then fun and marketing. From the About section of the website:

"I hope you will be entertained with the hyper-accurate, detailed photos on vibrant backgrounds, and the technical information presented with a little bit of spice, like the nicknames given to some of the watches."

 

Jacek just having a bit of fun and attracting some attention to his listings.
And it worked.