Wow! Huge side-clips.
Marvelous example of a .450 Express. Would like to see what's on the barrel flats.
Possible replacement fore-end? Different style of scroll engraving on the fore-end iron is noticeable, plus the repair? Checkering is a bit rough around the edges perhaps?

Weird English translation doesn't help!

Nevertheless, if the bores are good, a very useful working double with class!