Medieval silver groat of king Edward III York

Silver Groat (4d) of King Edward III (1327-1377), Fourth Coinage (1351-1377), Pre-Treaty period (1351-1361), Series D, Cross 1 initial mark. 

Obverse inscription: + EDWARD D G REX ANGL Z FRANC D HYB  (Edward by the Grace of God King of England and France Lord of the Irish)

Obverse description: Facing bust of king Edward in tressure of nine arches.

Reverse inscription: POSVI DEVM ADIVTOREM MEV / CIVITAS EBORACI (I have made God myhelper / City of York)

Reverse description: Long cross pattée dividing the legend, with three pellets in each angle.

DENOMINATION: Groat

CULTURE: Medieval England

MONARCH: Edward III

DATE: 1327 - 1377 AD (this coin minted between 1352 - 1353 AD)

MATERIAL: Silver

SIZE: 26mm diameter

WEIGHT: 4.58 grams

ATTRIBUTION: Spink 1571

PROVENANCE: Formerly in a private collection, Sheffield, United Kingdom