G'Day Fella's,

Herbertnb, as mentioned above plus this appears to be an Australian collaboration (Swan, Vinicombe).
Also, the initials "PJV" on the latch end of the floor plate, is probably for Phil Vinnicombe (the engraver).
Stock may be Australian grown, English walnut (of Exhibition grade).
Stockmaker, Swann?

Hope that helps

Doh!
Homer