When matching an existing Leadlight take a rubbing to get the design info.
We happened upon these windows whilst repairing a leadlight in Caulfield, Victoria. They show an unfortunate example of a substandard attempt to match the original, a 1916 Edwardian Leadlight (on the left). The poorly copied leadlight (on the right) has clumsy diagonal lines. The flowing curves defining the window as Edwardian have been removed, if a paper and crayon rubbing of the original had been undertaken the result would have been much more faithful to the original.