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Amgueddfa Cymru – Museum Wales
The Twyn Gwyn Colliery Company Limited, £1 ordinary shares, 1915, black on white and green. * Black print on white and green paper with handwritten details completed in black ink. Ornate border surround. Embossed company seal on lower left hand corner. 30 £1 shares numbered 666 to 695. Certificate number '18'. Dated 25 August 1915.
