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The arch, made by pupils from Solihull Junior School, was stolen between Sunday afternoon and the following morning.
It was part of the Warwick Road school’s 450th birthday celebrations and was at the entrance to a new play area.
School spokesman Julie Brown, said: “It is really upsetting to hear that the arch has been stolen because the pupils worked hard to create it and really enjoyed themselves doing so.”
Anyone with information can contact West Midlands Police on 0845 113 5000.
