From the Imperial Coins vcoins.com store:
http://www.vcoins.com/ancient/imperialcoins/store/dynamicIndex.asp

 PR145 - Lower Moesia, Odessus, Gordian III, AE23

 Item #: PR145 - Lower Moesia, Odessus, Gordian III, AE23
 Size: 23mm/7.05g
 Obverse: [AVT] K M ANT ΓOPΔIANOC A Head laur. r.
 Reverse: OΔHCCEITΩN Demeter, on r., and Persephone, on l., 
 standing facing one another, both holding long torches.
 Reference: AMNG 2322, SNG Copenhagen 681 (same obv. die)

       Price 
         US$ 49  € 40.12
        £ 27.22
        AUD$ 64.85
        CHF 62.34
        CAD$ 58.72

       Rates for 8/24/2005