See four images on GlassGallery, each with click main image to enlarge feature, via http://glassgallery.yobunny.org.uk/displayimage.php?pos=-20046
Hollow at the back, it doesn't work as an ashtray. It might be part of a lighting fitment, but I can't see how. More likely it went on a shelf with Gordon's gin bottles behind a bar.
I've seen bottle green examples with coloured enamel decoration before, but not this plain flint example.
I did wonder whether it might be a Nazeing production.
The boar's head is a symbol of the Gordon clan.
Any ideas on purpose, date, manufacturer, &c.?
Thanks for your interest,