DIOCLETIAN 284-305 AD. Aureus, Siscia. His laurelled bust to left, wearing the imperial mantle and carrying a sceptre surmounted by an eagle. R/ Mars advancing right, carrying spear and shield. Weight: 5.16 g. - D. 21.11 mm. - Cal. 4546. A very rare coin. Splendid coin with a golden patina and its original lustre. A superb example. Provenance: Brueder Egger, Vienna (Austria), sale 39 of 15 January 1912, lot n°1358; Jameson Collection, Chicago (USA), Collection R. Jameson Collection, Chicago (USA), sale n°2 of 1 January 1913, lot n°472; Bank Leu AG, Zurich (Switzerland), sale of 8 May 1979, lot n°472.