USA Aerogramme Used in the UK

 

USA aerogramme posted at Prestwich (27 AUG 1975) in the UK to the USA. 

The 18 cents aerogramme was first erroneously marked with an instructional handstamp „Contains enclosure“ and then with the correct „Postage invalid / Diverted to / Surface route / Manchester F.S.“

No obvious postage due handling in the USA.