A coalition Medal struck in brass

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A coalition Medal struck in brass
Aquatint and etching :
Plate mark: 9 7/8 x 7 1/4 inches (262 x 19 mm.); Design: 10 1/4 x 7 3/4 inches (250 x 185 mm.)
Purchased by J. Pierpont Morgan, 1900.
Peel 1298
Published: 
[Place not specified] : [publisher not specified], Published March 3, 1783.
Provenance: 
Formerly owned by Sir Robert Peel.
Inscription: 

Lower right corner, in pencil: 4...?

Notes: 

Watermark: Unknown.
Initials at the lower left edge of circle.

Century: 
Classification: 
Department: