The ancient processes of hand striking coins led to very pronounced double strikes. You don't need magnification to see the double strike here.



Maxentius Follis
Obv:– IMP C MAXENTIVS P F AVG, Laureate Bust right
Rev:– AETERNITAS AVG N, Castor and Pollux
Minted in Ostia (MOSTP), 1st Officina. Late A.D. 309 – October A.D. 312
Ref:– RIC VI – Ostia 35

Regards,
Martin