Jani:
His name is atop the rib. Upon 1st glance at just the watertable and not seeing the data string on the lower rib, I first guessed it to be similar to the post WWII stamps with the Ferlach maker's ID number. But later I didn't think that to be the case with the "Crown" over "Shield" stamp on the right tube flat. What about the diskset striker?

A nice quality smallbore double indeed.

Kind Regards,

Raimey
rse