Descrizione sommaria (sono indicate in rosso le parti della leggenda non più leggibili):
D. IMP NERO CAESAR AVG P MAX TR P P P.² Nerone, testa laureata a sinistra. Globetto sulla punta alla base del busto. Bordo perlinato.
R. SECVRITAS AVGVSTI³. S C  in esergo. La Securitas busto scoperto sino alla cintola, seduta a destra su un trono, testa reclina sul braccio destro appoggiato al trono, braccio sinistro che sorregge un corto scettro; di fronte a lei un altare inghirlandato ed acceso da cui fuoriesce una torcia. Bordo perlinato. 

La ricerca nel web di monete di tipologia simile a quella di figura ha prodotto i seguenti risultati:

1. http://www.wildwinds.com/coins/ric/nero/RIC_0597.2.jpg Roman Empire. Nero. A.D. 54-68. AE Dupondius. 13.40 grams. Obverse: IMP. NERO CAESAR AVG. P. MAX. TR. P. P. P. Nero, laureate, l. Reverse: SECVRITAS AVGVSTI. Security seated r., altar at feet; in exergue, S.C. cf Sear 684. Good Very Fine/Very Fine. $175.00 Mar-19-01.
2. http://www.wildwinds.com/coins/ric/nero/RIC_0597.3.jpg 29738 Nero, 54-68 A.D. AE Dupondius. Lugdunum. IMP NERO CAESAR AVG P MAX TR PPP. Laureate hd. l.; globe at tip of bust. Rv. SECVRITAS AVGVSTI S C. RIC 519. 14.64g. some

light corrosion on obv. Brown and green patina. about Extremely Fine $450.00.
3. http://www.cgb.fr/monnaies/rome/r12/fr/monnaies30df.html?depart=98&nbfic=414 Dupondius - c. 64 N° r12_0098 Cliquez sur l'image pour l'agrandir. Nom de l'atelier : Rome Diamètre en mm : 28 mm Axe des coins : 6 h. Métal : Bronze Poids observé : 11,11 g. Poids théorique : 13,53 g. Taille : 1/24 L., 12 scrupules Valeur : 2 as Rareté : R État de conservation : TB+ Prix 100.00 €uros (env. 655.96 FRF) AVERS Légende : IMP NERO CAESAR AVG P MAX TR P P P. Traduction : “Imperator Nero Caesar Augustus Pontifex Maximus Tribunicia Potestas Pater Patriae”, (Empereur Néron César Auguste Grand Pontife, revêtu de la Puissance Tribunitienne Père de la Patrie). Description : Tête laurée de Néron à gauche, avec le globe à la pointe du cou (O*1). REVERS Légende: SECVRITAS - AVGVSTI// SC. Traduction : “Securitas Augusti”, (la Sécurité de l'Auguste). Description : Securitas (la Sécurité) assise à droite, soutenant sa tête de son bras droit et tenant un sceptre court de la gauche ; devant un autel.
4. http://www.coinarchives.com/a/lotviewer.php?LotID=121405&AucID=141&Lot=406 Auktionshaus H. D. Rauch GmbH > Auction 74 Auction date: December 7th, 2004 Lot number: 406 Price realized: 130 EUR (approx. 175 U.S. Dollars as of the auction date) Lot description: Augustus - Vitellius Nero 54-68 n.Chr. Dupondius (14,42 g), Rom 67. Av.: IMP NERO CAESAR AVG P MAX TRP PP, belorbeerter Kopf links, unten Globus. Rv.: SECVRITAS AVGVSTI, Securitas sitzt rechts vor Altar. RIC:597, C:325; Rv. Doppelschlag s.sch. Estimate: EUR 80.
5. http://www.coinarchives.com/a/lotviewer.php?LotID=60351&AucID=63&Lot=2293 Gorny & Mosch Giessener Münzhandlung > Auction 126 Auction date: October 14th, 2003 Lot number: 2293 Price realized: Unsold Lot description: RÖMER RÖMISCHE KAISERZEIT Objekt-Nr.: 2293 Nero, 54 - 68 n. Chr. AE Dupondius, (14,97 g.), 66 n. Chr. Mzst. Lugdunum, Vs.: IMP NERO CAESAR AVG P MAX TR P P P, belorbeerte Büste auf Globus n. l. Rs.: SECVRITAS AVGVSTI / S-C, Securitas n. r. thronend neben Altar und Fackel. RIC 519 = 597; BMC 342. Herrliche dunkelgrüne Patina, Rs. leichte Prägeschwäche, vz Estimation: € 500,00.
6. http://www.coinarchives.com/a/lotviewer.php?LotID=52835&AucID=55&Lot=393 Numismatica Ars Classica > Auction 25 Auction date: June 25th, 2003 Lot number: 393 Price realized: 4,250 CHF (approx. 3,202 U.S. Dollars as of the auction date) Lot description: The Roman Empire Nero Augustus, 54 – 68 No.: 393 Schätzpreis - Estimate CHF 2500 d=29 mm Dupondius, Lugdunum circa 66, æ 13.31 g. IMP NERO CAESAR AVG P MAX TR P P P Laureate head r. with globe at point of bust. Rev. SECVRITAS AV – GVSTI Securitas seated r. on throne, resting head against her hand and holding short sceptre; in front of her, garlanded and lighted altar against which leans lighted torch. In exergue, S C. RIC 597 var. BMC 347. C 325. CBN 195. Reddish-brown patina and good extremely fine.
7. http://www.coinarchives.com/a/lotviewer.php?LotID=35973&AucID=39&Lot=2070 Gorny & Mosch Giessener Münzhandlung > Auction 118 Auction date: October 15th, 2002 Lot number: 2070 Price realized: 320 EUR (approx. 314 U.S. Dollars as of the auction date) Lot description: RÖMER RÖMISCHE KAISERZEIT Objekt-Nr.: 2070 Nero, 54 - 68 n. Chr. AE Dupondius, (12,10 g.), Mzst. Lugdunum, Vs.: IMP NERO CAESAR AVG P MAX TR P P P, belorbeerte Büste auf Globus n. l. Rs.: SECVRITAS AVGVSTI / S-C, Securitas n. r. thronend neben Altar und Fackel. RIC 597; BMC 347. Schöne grüne Patina, ss­vz Estimation: € 400,00.
8. http://www.coinarchives.com/a/lotviewer.php?LotID=41883&AucID=16&Lot=1502 Gorny & Mosch Giessener Münzhandlung > Auction 115 Auction date: March 5th, 2002 Lot number: 1502 Price realized: 200 EUR (approx. 174 U.S. Dollars as of the auction date) Lot description: RÖMER RÖMISCHE KAISERZEIT Objekt-Nr.: 1502 Nero, 54 - 68 n. Chr. AE Dupondius, (17,78 g.), Mzst. Lugdunum, Vs.: IMP NERO CAESAR AVG P MAX TR P P P, belorbeerte Büste auf Globus n. l. Rs.: SECVRITAS AVGVSTI / S-C, Securitas n. r. thronend neben Altar und Fackel. RIC 597; BMC 347. Schöne goldbraune Tönung, gutes Porträt, ss­vz Estimation : € 150,00.
9. http://www.coinarchives.com/a/lotviewer.php?LotID=18904&AucID=18&Lot=591 Münzen & Medaillen Deutschland GmbH > Auction 9 Auction date: October 4th, 2001 Lot number: 591 Price realized: Unsold Lot description: RöMISCHE MüNZEN KAISERZEIT Nero No.: 591 Schätzpreis - Estimation DM 1500,- Dupondius, Lyon, 66. Kopf mit L. n. l., Globus an der Büstenspitze. Rv. SECVRITAS AVGVSTI / S-C Securitas n. r. thronend, mit der Rechten den Kopf stützend, in der Linken ein Szepter haltend; vor ihr girlandengeschmückter, brennender Altar, gegen den eine Fackel gelehnt ist. 13,28 g. RIC 181, 597. BN 140, 195. C. 325. Giard, Lyon 119, 211. Originalfarbe. Leichter Schrötlingsriss. Fast vorzüglich.

-------------------------------

Note:
(1) Dupondio, oricalco. Riporto in tabella le caratteristiche fisiche dei dupondi della tipologia in esame presenti nei link di cui sopra: