In my current fantasy, this is a proof Athens’ Tet. The planchet was especially prepared & handled carefully. It was placed by hand between freshly prepared polished dies. It may well have been struck twice to impart the high relief design. Isn’t this basically the description of proof manufacture? Unfortunately, we don’t have the original Athens mint packaging and certificate of authenticity which came with the Tet You have to see this beast in-hand to fully appreciate the proof-like fields. Let’s see your ancients with proof-like fields or maybe some newly released Athena/owl Tets. Please post ‘em if you got ‘em.