1. l'apice inferiore del busto termini con una sferetta, presente nelle monete neroniane emesse dalla zecca di Lugdunum;
2. la leggenda del dritto sia: IMP NERO CAESAR AVG P MAX TR P P P;
3. Nerone indossi o meno una corona.

Asse¹, zecca di Lugdunum, 66-67 d.C., RIC I 544, BMC I 388, C I 303, indice di rarità "C"

D. IMP NERO CAESAR AVG P M TR P P P ². Nerone, testa scoperta a sinistra. Bordo perlinato.
R. S C a sinistra e a destra nel campo. Vittoria³ alata sorregge con le mani uno scudo inscritto SPQR. Bordo perlinato.

Di seguito riporto i link a monete "simili" a quella di figura reperiti nel web:

1. http://www.wildwinds.com/coins/ric/nero/RIC_0544.jpg Current Starting bid US $1.00 bid US $51.25 Dec-09-02 1 ROMAN EMPIRE NERO Emperor AD 54-68 As (9.7 grams, 28.95 mm) Obverse: IMP.NERO CAESAR AUG.P.MAX.TR.P.P.P, His bare head left Reverse: S.C, Victory flying left holding shield inscribed SPQR [Image] Reference: Sear 690 v., Van Meter 32 v. Grade: Very Fine Scarce Choice high relief portrait and all legible reverse with good relief Well centered. Well struck. Green patina A very light surface corrosion doesn't allow a good scan of the coin As it is, a very nice coin in hand with a nice high relief portrait Nero (AD37-68) was born Nero Claudius Caesar Drusus Germanicus on December 15 of the year 37 at Antium and originally named Lucius Domitius Ahenobarbus, Nero was the son of the consul Gnaeus Domitius Ahenobarbus and Agrippina the Younger, great-granddaughter of Emperor Augustus. In 49 Agrippina married her uncle, Emperor Claudius I, and the following year she persuaded him to adopt her son, whose name was then changed. Later, Claudius married Nero to his daughter Octavia and marked him out for succession, bypassing his own son, Britannicus. On Claudius's death (54), the Praetorian Guards, under their prefect Sextus Afranius Burrus, Agrippina's agent, declared Nero emperor at the age of 17. The initial five years of Nero's reign, guided by Burrus and the philosopher Seneca, Nero's tutor, were marked by moderation and clemency, although Nero had his rival Britannicus poisoned. In 59 he had his mother put to death for her criticism of his mistress, Poppaea Sabina. In 62 he divorced (and later executed) Octavia and married Poppaea. Burrus died, possibly poisoned, and Seneca retired. In July 64, two-thirds of Rome burned while Nero was at Antium. In ancient times he was charged with being the incendiary. According to some accounts, he laid the blame on the Christians-few at that time-and persecuted them. He sheltered the homeless, however, and rebuilt the city with fire precautions. The building programs, like the spectacles and free grain he provided for the populace, were financed by plundering Italy and the provinces. Viewing himself as an artist and a religious visionary, he scandalized the army and aristocracy when he appeared publicly as an actor in religious dramas. Meanwhile, the empire was in turmoil. Nero established Armenia as a buffer state against Parthia, but only after a costly, unsuccessful war. Revolts broke out in Britain (60-61) and in Judea (66-70). In 65 Gaius Calpurnius Piso led a conspiracy against the emperor; 18 of the 41 prominent Romans implicated in the plot perished, among them Seneca and his nephew, the epic poet Lucan. Poppaea was kicked to death by Nero, and he married Statilia Messalina after executing her husband. In 68 the Gallic and Spanish legions, along with the Praetorian Guards, rose against him, and he fled Rome. Declared a public enemy by the Senate, he committed suicide on June 9, 68, near Rome. Encarta Encyclopedia 2000.
2. http://www.wildwinds.com/coins/ric/nero/RIC_0544.5.jpg May 07, 1999 - 08:00 PM PT (85 Lots) Lot: 29 Nero. Ancient. AE As, 10.9 grams. (Sear690) 54-68 AD. Grade:Fine Rx: S C, Victory flying left holding shield inscribed SPQR. [L266256] Next Bid: $67.00 .
3. http://www.wildwinds.com/coins/ric/nero/RIC_0544.3-o.jpg

http://www.wildwinds.com/coins/ric/nero/RIC_0544.3-r.jpg
Currently $73.00 Oct-01-01 ORC2015 Nero, as, Victory & shield VF Nero, Æ as, (8.46g) IMP NERO CAESAR AVG P MAX TR P P P Bare head left. / No legend. Victory left, bearing shield marked S P Q R. RIC 544. VF, brown patina, flan flaws on legend. 
4. http://www.wildwinds.com/coins/ric/nero/RIC_0544.1.jpg Currently $52.90 Jun-07-01 Roman Empire. Nero. A.D. 54-68. AE Dupondius. 10.336 grams. Lugdunum Mint c. A.D. 66. Obverse: IMP. NERO CAESAR AVG. P. MAX. TR. P. P. P. Nero, bare-headed, l. Reverse: S - C to l. and r. of Victory flying l., holding in both hands shield. RIC 182, 544. WCN 596. BMC 387. Very Fine/Fine+.
5. http://www.classicalcoins.com/product150.html R0690 2000 Nero: AE As $100.00 Obv. IMP NERO CAESAR AVG P MAX TR P PP Laur. hd. l. Rev. S C Victory flying l. hldg. shield Sear 690; RIC 544 sl. uneven, oth. nVF.

Un saluto cordiale.
Giulio De Florio
 

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Note:
(1) Traggo dai link sopra citati e da BMC le caratteristiche fisiche di alcuni assi della tipologia di figura battuti dalla zecca di Lugdunum che raccolgo di seguito in tabella: