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It'll be interesting to know exactly how these catalogs value each item. When a single US 1-cent stamp that was very common back in the 90's is valued at $0.25 is that because it's an awesome collectible?
Most catalogues will use a minimum value. This does not reflect a value but rather a minimum cost for holding a stamp in stock.
A catalogue like that issued by Stanley Gibbons is a price list. Any stamp priced at £ 1 or less - usually less than £ 1 reflect a lacl of updates - should be considered to have no or 'minimal' value.
Catalogues like Scott that claim to provide 'market' values (usually markets discount from those prices), often use minimum value that does not reflect market value.