In addition to sheet stamps, two values, 10 cents and 15 cents, were produced as coil stamps for use in vending machines in several locations throughout Malaysia. The designs were similar to the state values, but produced with 'Malaysia' in place of a state name as they were for use in any state. These coils were printed by Harrison & Sons in photogravure. From the start, the coil stamp machines proved to be inefficient at dispensing the correct values for the money tendered, possibly due to humidity affecting the stamps. Due to these problems, the machines were dispensed with quite soon after they commenced their duty. As a result, commercially used examples of both values are scarce. During 2006 a variant of the gum was identified. It is brown, with a clear 'ribbing' effect. This may have been a trial to overcome some of the problems with the machines, the ribbing possibly helping to prevent curling of the individual stamps. Harrison Proof Cards exist for both values with an imperforate stamp in full colour on each.