This is an antique copper haystack measuring jug, likely from the 19th century. It is marked for a half pint capacity. These measures were historically used in English inns and public houses for pouring ale and cider. The wide-based form gives it the characteristic "haystack" name. The copper has developed a rich patina over time, a testament to its age and use. It features a lead verification or assay mark on the spout, which indicates it was an officially verified measure.