Messenger Service Mercury Head Stamp - Need ID

[Pocket Change]

Messenger Service Lite Pink Imperforated or Cut off envelope. Need Identification. Thanks

 

[Slingshot]

Process of elimination - I don't see this design in my Scott's US catalogue under Carriers, or Locals. My guess is that it is from another English speaking country. You might find it in a Gibbon's catalogue, since they specialize in British related material. Good luck!