Based on the design, manufacturer markings, and historical data, this Blow Butter Churn was manufactured in England, most likely during the 1930s or 1940s. While the Blow Churn Company (based in London and Derbyshire) began producing household glass churns in the early 20th century, the specific square-shouldered jar and the "4 Imperial Quarts" capacity were hallmarks of their peak popularity during the interwar and early post-war years. The square base and metal screw-top gear assembly were standard for the 1920s–1940s era. By the late 1940s and early 1950s, some manufacturers transitioned to more "streamlined" or tulip-shaped jars. This vintage Blow Butter Churn, manufactured in England, features a substantial 4-imperial-quart clear glass jar with square-shouldered styling and embossed lettering. The mechanical assembly includes a hand-cranked cast-iron gear system with a wooden handle, driving an internal four-blade wooden paddle designed for traditional butter making. Standing 38.5cm high and 17cm wide, the piece is in good vintage condition; the glass remains clear and intact with visible embossed markings, while the metal lid and gear housing show a heavy, authentic aged patina and surface oxidation consistent with its age. The wooden internal paddles are present and in good shape.