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Unique ID: LON-0EB7D4
Object type certainty: Certain
Workflow status: Awaiting validation
A post medieval tin halfpenny of James II dating between AD1685-1687. The obverse depicts a laureate and cuirassed bust of the king in profile facign right. The inscription reads "IACOBVS.SECVNDVS". The reverse depicts a seated Britannia and the inscription reads "BRITANNIA".
The coin has a central square perforation that would have been filled with a copper alloy plug, which is missing. http://www.coins-of-the-uk.co.uk/farth.html: "In 1684 the farthing was issued in tin with a copper plug in the centre.[...] These are scarce coins in as good condition as that illustrated because of tin disease. This is caused by the fact that below 13.2°C the metallic form or allotrope of tin tends to turn into the non-metallic form which appears as a grey powder. Also, tin is soft and wears readily. Tin was chosen to bolster the tin mining industry, and the bimetallic form was intended to discourage forgery (but failed in its purpose)."
Parallels can be found on the PAS database: LANCUM-2CD3D0, SUR-A82417, LEIC-68C2D3 and LEIC-68DCF4
Dimensions: diameter: 30.11 mm; weight: 10.26g.
Subsequent action after recording: Returned to finder
Weight: 10.26 g
Diameter: 30.11 mm
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Ruler/issuer: James II of England
Mint or issue place: London
Type: Halfpenny (tin): James II (S 3419)
Obverse description: A laureate and cuirassed bust of the king in profile facing right
Obverse inscription: IACOBVS SECVNDVS
Reverse description: A seated Britannia.
Reverse inscription: BRITANNIA
Die axis measurement: 6 o'clock
No references cited so far.