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Amgueddfa Cymru – Museum Wales
Red brick, with frog, with incised inscription on obverse. Found fly-tipped at ‘Cyfarthfa Willow Cinder Tip’, Merthyr Tydfil, a tip used by Ynysfach Ironworks from around the 1830s, until 1868 when construction of the Brecon & Merthyr Railway severed access to the tip.