Red speckled canteen cup marked F7/S

Nice black bakelite canteen cup which features red speckles all over the cup! This is one of the first examples I have ever encountered with red speckles. The cup is in salty, untouched condition. The MPD code F7/S Indicates production by an unknown maker and that the used material is Phenolic resin (bakelite) with sawdust as the filler material. Rare bakelite cup with interesting red speckles!