From the Pars Coins vcoins store. See http:/www.parscoins.com.
                   
                  Antoninus Pius & Marcus Aurelius 

                  PCW-R229-Antoninus Pius & Marcus Aurelius, 138 - 161 AD. Gold 
                  Aureus circa 140 AD. 6.45 gm. 18 mm. ANTONINVS AVG PI - VS P P 
                  TR P COS III Laureate head of Antoninus Pius r. Rev. AVRELIVS 
                  CAESAR AVG P II COS Bare head of Marcus Aurelius r. RIC -, cf. 
                  417a (denarius). BMC -, cf. 155 (denarius) and pl. 4, 8 (this 
                  reverse die). C -, cf. 15 (denarius). Vagi 1433 var. Calicó 
                  1726. Fully struck. Choice Good VF and Rare.

                  "Although Antoninus Pius succeeded Hadrian as emperor of Rome, 
                  he truly was third or fourth down the line of preference. 
                  Hadrian's first choice as successor was the nobleman Aelius, 
                  who was hailed Caesar in 136, but who died unexpectedly after 
                  a year in office. Hadrian then determined he would pass the 
                  throne to Aelius' son Lucius Verus - then only seven years old 
                  - and to the 17-year-old Marcus Aurelius, who was a distant 
                  relative and a close companion. In truth the middle-aged 
                  Antoninus Pius was merely a surrogate emperor in the eyes of 
                  Hadrian, and he remained truthful to his promise to act as 
                  guardian for Marcus Aurelius and Lucius Verus. Indeed, he was 
                  so faithful to the memory of Hadrian that he earned his 
                  surname "Pius" because he fought so diligently to convince the 
                  senate's to deify Hadrian. Over the years of his own 
                  principate, Antoninus Pius groomed both as his eventual 
                  successors, and thus continued the tradition of adoptive 
                  succession. He enjoyed a productive and mostly peaceful reign, 
                  and unlike Hadrian, who traveled extensively, Antoninus Pius 
                  never once left Italy in his twenty-two years on the throne. 
                  Unlike the great variety of Hadrian's coinage on which he 
                  celebrates his extensive travels, Antoninus' reverse types are 
                  localized, and on occasion they reflect the attention he paid 
                  to the betterment of Rome and Italy. This aureus is one of his 
                  more interesting types, as it bears the portrait of Antoninus 
                  Pius on the obverse and that of his elder heir Marcus Aurelius 
                  on the reverse".


                        Price 
                          US$ 6,950  € 5737.72
                         £ 3978.62
                         AUD$ 9111.54
                         CHF 8957.25
                         CAD$ 8463.71

                        Rates for 7/21/2005