u/Additional_Wing_1946

Image 1 — Great Britain 1883 Queen Victoria 10 Shillings Grey (SG 183) - Need authentication & info on back mark

Great Britain 1883 Queen Victoria 10 Shillings Grey (SG 183) - Need authentication & info on back mark

Hello everyone, I would appreciate your expertise on this Great Britain 10 Shillings stamp (Queen Victoria, plate 1). The front is in grey, and the back shows a very clear original gum with a small red expertizer/dealer stamp or mark.

Can anyone help me identify the red mark on the back or confirm if it’s a known expert signature? Any thoughts on its condition and potential value would be highly appreciated. Thank you

u/Additional_Wing_1946

Great Britain 1883 Queen Victoria 10 Shillings Grey (SG 183) - Need authentication &amp; info on back mark

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Great Britain 1883 Queen Victoria 10 Shillings Grey (SG 183) - Need authentication & info on back mark

Bavaria 1919-1920 Imperforate Proofs & Trial Printing Set, Wide Margins, OG, Wmk Wavy Lines. Includes Freistaat & Volksstaat Overprints with High Mark Values

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