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A silver military challenge coin featuring two submarines in blue water with the text 'NAVO SUBMARINE PRODUCTS' and 'SUBSIDIUM SUBMARINUM'.

A silver military challenge coin featuring two submarines in blue water with the text 'NAVO SUBMARINE PRODUCTS' and 'SUBSIDIUM SUBMARINUM'.

Mock up 2" military challenge coin with "NAVO Submarine Products" arched along top, image of two underwater US submarines (SSN and SSBN), bathymetry contours with various depth changes in center and "Subsidium Submarinum" along the bottom in silver color See more