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Mark I male 759 D17 at Dinnaken, Somme, September 1916.
A poignant ring made from a shard of glass that struck a First World War tank commander when his periscope took a direct hit has been unearthed 100 years later.
Lieutenant Sir Basil Henriques was peering into the viewpoint during the first outing of the Mk I tank on the battlefield when artillery fire struck a glass prism that shattered, sending splinters into his face.
Medics later removed the pieces and the officer kept the largest part and had it mounted in a gold ring which he then gave to his new bride, Rose. The item has been unearthed in the archives of the Tank Museum in Dorset.