Hello.
I wonder why the serial number in my watch do not have the black background, but the one in the Toppers picture has?
Maybe Al knows?

 

it's just a black reflection,

 

The part is polished. It's a reflection, m8. Similar to the bottom half of the "teeth" to open the caseback in the same pic.

 

Thanks, that is relief, i was wonderind if that is a sign of some kind of updated movement