Believe it or not these are all different in some way be it small or large even down to the size of the point they spin on or the number of rings on the finger ends etc. I often see these on ebay in the Trench Art section but I do not think they are trench art but commercially produced. Trench Art is a misnomer anyway as very few pieces were made by soldiers in the trenches but by French or Belgium civilians to sell to the soldiers to take home. i pick these up when I see them in charity shops etc one day I will sell them as a collection .