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<p>[QUOTE=&quot;gsimonel, post: 2955725, member: 82549&quot;]Somebody needs to do a study of T-F vs. S-A. (Somebody smarter than me, that is.) These field letters occurred in A.D. 307-309, too.</p><p>S-A was first, A.D. 307-308:</p><p><img src="http://feltemp.com/Images/11.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>Treveri (Trier) mint, A.D. 307-308</p><p>RIC 772a</p><p>Obv: IMP CONSTANTINVS P F AVG</p><p>Rev: MARTI PATRI CONSERVATORI - Helmeted Mars, with shield and reversed spear</p><p>PTR in exergue; S in left field, A in right</p><p>26 mm, 6.9 g.</p><p><img src="http://feltemp.com/Images/12.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>Treveri (Trier) mint, A.D. 307-308</p><p>RIC 776</p><p>Obv: IMP CONSTANTINVS P F AVG</p><p>Rev: MARTI PATRI PROPVGNATORI - Helmeted Mars, with spear and shield</p><p>PTR in exergue; S in left field, A in right</p><p>26 x 24 mm, 6.5 g.</p><p><br /></p><p>Followed by T-F in A.D. 309:</p><p><img src="http://feltemp.com/Images/18.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>Treveri (Trier) mint, A.D. 309</p><p>RIC 830</p><p>Obv: IMP CONSTANTINVS P F AVG</p><p>Rev: MARTI PATRI CONSERVATORI - Mars, helmeted, nude, standing, facing right, holding reverse spear, resting shield on ground</p><p>PTR in exergue; T in left field, F in right</p><p>25 mm, 7.6 g.</p><p><br /></p><p>Only to return again, as you noted, in A.D. 313-316:</p><p><img src="http://feltemp.com/Images/50.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>Treveri (Trier) mint, A.D. 313-315</p><p>RIC (v.7) 47</p><p>Obv: CONSTANTINVS P F AVG</p><p>Rev: SOLI INVIC-TO COMITI - Sol, standing right, looking left, holding globe in left hand, right hand raised</p><p>PTR in exergue; T in left field, F in right</p><p>19 mm, 3.4 g.</p><p><img src="http://feltemp.com/Images/55.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>Treveri (Trier) mint, A.D. 316</p><p>RIC 118</p><p>Obv: CONSTANTINVS P F AVG</p><p>Rev: MARTI CONS-ERVATORI - Mars, helmeted, in military dress, standing right, looking left, holding spear and resting hand on shield.</p><p>BTR in exergue; T in left field; F in right.</p><p>20 mm, 3.2 g.</p><p><br /></p><p>(I don&#039;t have any examples of coins with A-S field marks from this period.) So what is the significance of these letters? Why are they used for a few years, disappear for a while, and then return?[/QUOTE]</p><p><br /></p>

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