Definition of seam:
"1952: As white glass was 6s. the 'seam', containing 24 'weys' (pise, or pondera) of 5 lb., and 2 1/2 lb. was reckoned sufficient to make one foot of glazing, the cost of glass would be 1 1/2d. leaving 2 1/2d. for labour. &mdash"
to put together with a seam; to mark with a seam