Great news, they accepted my offer & it looks like I will be
acquiring the vintage Rigby. It's a 400/350 NE in original condition.
The bores are in very good condition (per report) & comes with
dies, bullets & brass. It also comes with the original (numbered
to the rifle) scope rings along with a second set of identical
scope rings with a vintage Rigby scope.

Apparently the Rigby was sold to a Lt Col VM Stockley in 1903. He is
the author of "Big Game Hunting in Burma, India & Somaliland". I
found a copy of this book on the internet, so should be interesting
reading!

I hope to have more info & even pics when I receive it. Thanks
again for everyone's input.