Beautiful Lebeau...
My 1929 Purdey has #58905/58906 tube set Whitworth #s.
So I think these barrels are contemporary to the action.
The inspector marks are hearsay and should not be used to date a gun IMHO. The k is 1932 indeed.
Interesting to see that Lebeau used Scott-like gas checks instead of disc set strikers.
Best regards,
WC-