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Message:: [QUOTE="lehmansterms, post: 4259700, member: 80804"]In the 4th century, the field marks, rather than being officina designations, are often "controls" like this extensively "coded" Valentinian I centenionalis from Siscia: <img src="http://old.stoa.org/albums/album82/A_06_SisV1_GloRom3.sized.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /><a href="http://old.stoa.org/gallery/album82/A_06_SisV1_GloRom3?full=1" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://old.stoa.org/gallery/album82/A_06_SisV1_GloRom3?full=1" rel="nofollow">http://old.stoa.org/gallery/album82/A_06_SisV1_GloRom3?full=1</a>  The officina designation ("B" in this case, 2nd officina) is part of the exergual mint mark which additionally has a "c" as part of the control code sequence. Siscia in the 360's is particularly known for a bewildering range of different exergual + field mark controls. Thessalonica is a close runner-up. In RIC IX, both have sections several pages long listing and assigning numbers to all the different combinations (45 known possible combinations for Siscia during this reign are listed in the Siscia charts in RIC IX. It's an old volume and there may be even more known now).[/QUOTE]