This is an original WW1 trench art trinket box.
It is made with the ends of two shells dated 1915 (see pictures).
The base has an Engineer Insignia and 3 coins on each side dating around 1918.
The lid has a piece of shrapnel, a bullet, and two coins dated 1855.
It appears to have had maybe 3 or 4 other items at sometime in the past.
The box measures about 2 3/4" high and weighs about 4 1/4lbs.
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