USS Blueback SS 581 Brass plaque 4 lbs 5 oz 9.5×10 in polished details c7922. BC Patch has been in business since 1984 providing collectible patches, pins, caps, plaques and more. Plaques are brass, bronze and resin. Ball caps – we do all our embroidery in house. All submarines caps can be created, but not limited to submarines. Decals -submarine, American flags.