Oswald Marsh (26 October 1880 – 4 August 1951)[1] was a London stamp dealer who specialised in cut-outs.
He is thanked in the preface to Herbert L'Estrange Ewen's Priced Catalogue of the Unadhesive Postage Stamps of the UK 1840-1905 which was published in 1905 and was well established enough to publish a book by W.H.
Bertram Poole in 1906 and Sam Buckley's Marginal Varieties of the Edwardian Stamps of Great Britain, 1902-1912 in 1912.
[3] Marsh also acquired the business of Errington & Martin, trade binders and producers of stamp albums.
Marsh continued in business until his death in 1951, after which it was taken over by his son Herbert and daughter.