No mystery, and not Alasdair Gordon (note the spelling). That piece is wheel engraved and sand blasted by Arnie Gautsch of Lismore, NSW. See below for another example of his work, found in an 'antiques' shop locally in Lismore. The image is the Australian platypus (
Ornithorhynchus anatinus). The signature on this item, shown in the second photo, is the same monogram AG seen on the query item.
His work is found in several galleries, including
the family business. The other two photos show a different version of his signature and a gallery sticker, both taken from a larger item.
For blanks, mostly he uses commercial European production items from such as IVV and Krosno.
Trevor