Identity of these signa

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Salve,<br>
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What are the reasons for considering the standards on the two imperial coins as related to the <i> speculatores</i>? Is there a text on the other side indicating a link with these troops or is the relation inferred from the type of standard?<br>
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There is an inscription which has a career including a position as <i> speculator</i> and an unclear post with the Pontic fleet.<br>
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AE 1968, 497: [...] Celerem qui militavit decurio / [...e]t spec(ulator) et mo( ) praef(ecti) clas(sis) Po(nticae).<br>
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Any idea what the <i> mo(?)</i> could be?<br>
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Regards,<br>
<br>
Sander van Dorst <p></p><i></i>