155 NGC Ch VF Antoninus Pius Roman Empire Denarius Hybrid Mule Mint Error Pax (21090803C)

Choice Very Fine Emperor Antoninus Pius Roman Empire silver denarius coin. Rare, apparently unpublished muling of obverse and reverse dies that BOTH have TR P XIX date, issued 155/56 CE. Reference RIC 246 for obverse dating & RIC 252 for reverse dating. Roman denarii of Antoninus Pius typically have a TR P date on either of obverse or reverse, but NOT both.  This is an example of an error pairing (muling) of dies likely from different mint workshops that both have the TR P XIX date. NGC Certified  to Ch VF,  Strike 4/5, Surface 5/5, 3.33g.   Obverse: ANTONINUS AVG PIVS PP TR P XIX, laureate bust of emperor Reverse: TR POT XIX COS IIII, Pax standing left, holding branch and corucopiae Normal, not muled, denarii  for this emission would have obverse and reverse legend combinations as follows with TR P XIX given only once: Normal Dated obverse (RIC 246) Obverse: ANTONINVS AVG PIVS PP TR P XIX Reverse: COS III Normal Dated reverse (RIC 252) Obverse: ANTONINVS AVG PIVS PP