Uniface Die Trials are deliberate, one sided impressions using either the obverse or reverse die. These Die Trials can be from finished or unfinished dies. Sometimes hubs are used, rather than the actual finished die. Metals other than the adopted composition are frequently used to strike Uniface Die Trials.
This is the only known 1911 Great Britain 5 Pound Die Trial. It was struck on an oversized lead planchet with a width of 44.32mm and is 5.69mm thick. It is a uniface die trial of the finished obverse die used strike the 1911 gold 5 Pound in proof. It was struck in high relief exhibiting a full strike and detail, which is unusual with lead die trials.