Readers may find this of interest:

Out of curiosity I made an email inquiry to David McKay Brown to ask for a price list. This morning I received a reply.

The price of a double .470 NE is 38,000 pounds sterling excluding engraving.

I then went to the Yahoo currency conversion webpage.

38,000 pounds sterling =
$72,500 USD
$94,500 AUD

Engraving is added to these numbers.

Regards,
Curl