David Jones, 68, was last seen shortly after 6am on Sunday, August 15.
He is white, about 4ft 11ins tall and has brown hair.
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Derbyshire police say David left his home in New Mills, High Peak, wearing a green and black hooded coat, grey trousers and black shoes.
If you have seen David, or know where he is, contact 101, quoting incident 255 of August 16.