A decorative cloth covering placed over the driver's seat or box of a carriage, often elaborately embroidered or marked with a coat of arms.
From 'hammer' (the projecting seat of a carriage) plus 'cloth'; the 'hammer' was the elevated platform where coachmen sat, and wealthy families displayed status through ornamental cloths.
Hammercloths were the Victorian equivalent of custom car upholstery—wealthy families invested heavily in these visible coverings to display their coats of arms while bumping through muddy streets.
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