Diademenian and Macrinus - Very rare and enigmatic coin! (F1818)

A mysterious rev.: Himation and attitude would match Zeus. But the youthful and unbearded portrait is unusual. HrJ mention Diadumenian! And until now the meaning or function of the long bent object is not known. But similar objects on coins from Ankyra suggest that it is a sacral attribute. Please look at the discussion: http://www.forumancientcoins.com/board/index.php?topic=27381.msg178736#msg178736

Moesia inferior, Markianopolis, 24. Macrinus &Diadumenian, HrJ (2013) 6.24.34.02 (plate coin) 

Macrinus & Diadumenian, AD 217-218

 AE 27, 12.46g,26.64mm  struck under governorFurius Pontianus

 obv. AVT K OPEL CEVMAKREINOV AVT KM OPEL ANTWNEINOC

 Confronting heads ofMacrinus, laureate, r., and of Diadumenian, bare, l.

 rev. VP PONTIANO - VM - ARKIANOPOLI / TWN 

 Male figure inhimation stg.l., holding an unknown long bent rod in l. arm and in r. 

 hand patera overburning altar

 in r. field E

 ref. a) AMNG I/1,777, pl. XIX, 12, same rev. die (1 ex., Paris)

b) Varbanov (engl.) 1279 corr. (has CEVH)

 c) Hristova/Jekov(2013) No.6.24.34.2 (plate coin)

 very rare, F+