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CONSTANTINE I 'THE GREAT'- ROMAN EMPEROR: 307-337 A.D. -
Large Bronze Follis (27mm ,7.77 gm.) London,  Autumn 307-summer 308 A.D.
Reference:  RIC 89b. C.196.
FL. VAL.  CONSTANTINVS NOB . C.  Laureate, draped, and cuirassed bust right.
GENIO. POP. ROM. Genius standing left  PLN in exergue. (London).

Numismatic Note* The primary Mint mark is engraved on the reverse of the coins in the exergue. The earliest coins (c. 297), a small and rare issue, are marked LON. Other early issues (300 - mid 307) do not have Mint marks [1]. The PLN Mint mark was introduced in the summer of 307 and continued until 314 when it was superceded by the M series marks, to be resumed again in 316 and continued in use until 321 (used concurrently with PLON in the last year of usage). The M series marks: MLL, MSL and MLN were used 314-316. The PLON mark was introduced in 320 and was used until the London Mint closure in 325. Commencing in mid 310, the primary exergue Mint marks are frequently accompanied by a variety of letters/symbols in the reverse field. All of these Mint marks are depicted on coin images throughout these Roman Coins of the London Mint pages.