We have a suggestion that this might be a dandelion weeder similar to one offered by Lee Valley, which claims their design is a century or so old from England. They state "Originally called the 'Star Patent Daisy Grubber' when it was made in England a century ago, this tool was used for removing long-rooted weeds from lawns and gardens."  Another website shows a "Robt. Sorby Daisy Grubber, 47 cms long, Used for extracting daisies and levering out small difficult weeds, this daisy grubber was made by Robt. Sorby, Sheffield and carries the maker's mark. Early 20th Century."