A seam is an obsolete unit of volume or mass in the United Kingdom The Oxford English Dictionary includes definitions of a seam as:
6–8 imperial pecks (55–73 L) of sand 9 imperial pecks (82 L) of apples 8 imperial bushels (290 L) of grain 120 pounds (54 kg) of glass (or 100 pounds (45 kg) in the 14th century) a cart-load, sometimes of a specified amount such as 2 hundredweight (100 kg) of straw or 3 hundredweight (150 kg) of hay or manure. Cardarelli asserts that it was equal to 64 imperial gallons (290 L).
References
External links "Seam". Sizes.com. A collection of further definitions and quotations
