The queen’s coffin it is made of English oak and reinforced with lead. It was made decades agoexperts say. Sarah Hayes, manager of the Coffin Works coffin museum in Birmingham, England, said former Prime Minister Winston Churchill, the queen’s husband Prince Philip and Princess Diana had similar coffins. “It’s to preserve the body as much as possible, it’s about slowing down the decomposition process,” she said. This is especially important to the queen because the coffin will eventually be deposited in a church, and will not be buried, she added. The oak is from the estate of the royal family at Sandringham, following royal tradition, she said.