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Thank you for the reply.The therm "Trench Art" should strictly be used for the unique items made during the WWI aka the "Trench War". Therefore it should not be used for items made during other periods. When you say Trench Art in the collecting world people would know you are talking about WWI. It's like when you say Baroque or Art Deco - it is a personal noun and should be written with capital letters - it means you are talking about specific period of time including the look of the items.