Rare speckled brown green canteen cup marked F7/K

Rare speckled brown green bakelite canteen cup marked F7 K in goodcondition. This is one of the rarest coloured canteen cups. The material marked as K is a fine marbled Urea resin often referred to as bakelite. The speckled colours show a dominant brown undertone. This example is in very good condition with only minor damages. These coloured cups were always found on 0,5 Liter capacity water bottles. This is a very rare example, of a handfull known examples. This is a double from my collection which otherwise would never leave. Scarce opportunity to acquire one of the rarest bakelite canteen cups!