Stunning flat, square 15 carat gold seal, decorated with a dolphin at each corner, their tails meeting a ball at the top that holds the gold bail. 
The base is set with a bloodstone seal, carved with a heraldic motif , and on the banner the words 
‘Nuncia Pacis Oliva’ 
The Olive Branch Is A Messenger Of Peace
And is the motto of the Buchanan Family
The dove ontop of the crown carries an olive branch 
Weighs - 25g
Measures - 30 x 25mm
Base 27mm tall 
15 carat 
English circa 1870-80
Excellent condition