A miscellaneous charges order (MCO) is an accountable IATA document, similar to an old-style airline ticket, used to process the payment of travel arrangements. They are issued by airlines, but normally pay for services other than airfares. A MCO may be used to purchase most services offered by airlines, hotels and tour operators.
This one was for £3 addressed to Hertz at Liverpool. Its purpose was for car hire. In some eight years this is only the second one I have seen. It now is kept in the archives.
Eagle Pennant's Donated by Keith Moody