US Hawaiian Sesquicentennial Overprint Stamp (not authenticated)

The item is a postage stamp mounted within an album page that features printed text reading 'HAWAIIAN SESQ' above and 'Hawaii' below the display window. The stamp itself is red in color and appears to be a perforated US definitive issue featuring an engraved profile of George Washington. Overprinted in black across the center of the design are the words 'HAWAII' and the dates '1778 - 1928'. The value numeral '2' is present in the lower corners, accompanied by text reading 'WASHINGTON CENTS'. The stamp displays perforated edges on all sides, though minor irregularities in the perforation alignment are visible. The paper shows a typical matte finish consistent with early 20th-century philatelic production. There are no obvious tears, creases, or major surface soil marks visible in this view, but full evaluation of gum condition and paper integrity remains unverified without physical inspection. The attribution of this piece relies on the visual presence of the black overprint text and the underlying stamp design matching known commemorative issues from the 1928 period, though the item is uncertified and remains strictly unauthenticated.

Based on what I can see in the provided image, the item appears to be a US 1928 Hawaiian Sesquicentennial overprint stamp mounted on an album page, displaying features consistent with Scott #647. The design shows a red Washington definitive background with the black 'HAWAII' and '1778 - 1928' overprint. I cannot verify from a photo the paper integrity, true gum condition, or whether the overprint and perforations are entirely untampered with. The estimated market range of $200 to $400 assumes that the stamp and overprint are as they appear and would pass physical inspection; however, because this piece remains strictly unauthenticated, an uncertified or lesser-quality example of this type typically trades at a significantly lower tier. If physical examination were to reveal this piece as a modern reproduction, replica, counterfeit overprint, or forgery, the market value would drop to near-nominal novelty value, likely under $15. General market demand for US commemorative overprints from the classic era remains steady among thematic and specialized collectors. To establish a higher level of certainty regarding its condition and nature, the item would need in-person physical examination, specialized paper analysis, and formal certification by a recognized philatelic expert committee.