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A pattern coin is a coin that has not been approved for release, but produced to evaluate a proposed coin design.
Technical Specifications:
Diameter:28 (mm)
Edge: Plain
Weight: 9.36 g.
Composition: Copper and Bronze
Mint: Royal Mint, UK.
Mintage: unknown
The Pattern prepared by Thomas Wyon, a Probationer Engraver of the Royal Mint, London.
@oizaguirres thank you for the tips.