Where is the serial number of Bessa 4A

[dng88]

Sorry for such a simple question but I cannot find the serial number of my new Bessa 4A. Any hint where I should look on the camera?

 

[Sam N]

Check the flash hot shoe. I think it's just engraved but not painted, so it might be a bit hard to see the black-on-black.

 

[dng88]

Saw it. Many thanks