The Trench Art Soldiers Cap / Hat is a unique collectable piece from World War I or II, specifically crafted by soldiers from Great Britain. This item falls under the category of Militaria and Trench Art, showcasing a piece of history from the era of 1914-1945. The cap/hat would have been personalised and created during this tumultuous time, making it a valuable and sentimental item for collectors or enthusiasts of military history. Whilst there is no Hallmark, this does shine up "as silver" with silver polish / cloth, as such I believe there to be a trace.
