4c Orange Brown, Vertical Imperforate Coil (346V).
Single with vertical guide line, tied by "Pittsburgh, Pa, Feb 18 1911" machine cancel on illustrated cover (front and back) of the Pittsburgh Steel Co., this is the earliest document use
, Junction Tex. backstamp of Feb. 22, cover has been expertly restored (due to the bulky contents which are included), the restoration not affecting adhesive or markings, Very Fine appearance, one of only four recorded covers with the 4-Cent Vertical Imperforate Coil (all from the same company), ex Berkun
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