Air Crash Mail Researching Now

I recently acquired this rather odd bit of mail.. It was recovered from BOAC Flight 712. An unfortunate series of events lead to the crash at the end of the runway. Brave actions saved all but 5 passengers on the 127 passenger and crew flight. havent read it yet!
Does one call the green print a cachet?

It is called an 'auxiliary marking'.
Don

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BOAC Flight 712

The burning 707–465, showing the tail section's skin melted to expose its interior. Accident Date 8 April 1968 Summary Fire in number 2 port engine Site Hounslow, United Kingdom.
Aircraft type Boeing 707-465
Aircraft name Whisky Echo
Operator BOAC
Registration G-ARWE
Flight origin London Heathrow Airport, Middlesex, United Kingdom
1st stopover
Zürich Airport, Zürich, Switzerland
2nd stopover Singapore International Airport, Singapore
Destination Sydney Airport, Sydney, Australia
Occupants 127
Passengers 116
Crew 11
Fatalities 5
Injuries 38
Survivors 122
BOAC Flight 712 (callsign Speedbird 712) was a British Overseas Airways Corporation (BOAC) service operated by a Boeing 707-465 from London Heathrow Airport bound for Sydney via Zurich and Singapore. On Monday 8 April 1968, it suffered an engine failure on takeoff that quickly led to a major fire. The engine fell off the aircraft in flight. After the aircraft had made a successful emergency landing, confusion over checklists and distractions from the presence of a check pilot contributed to the deaths of five of the 127 on board.
The actions taken by those involved in the accident resulted in the award of the George Cross posthumously to stewardess Barbara Jane Harrison. Two other crew members received awards; a BEM and an MBE. As a result of the accident, BOAC changed the checklists for engine severe failures and engine fires, combining them both into one checklist, the "engine fire or severe failure" checklist.

This is an example of what is variously called an "Interrupted Flight" cover, a "Crash Cover" or a "Recovered Mail" cover. There are many avid collectors of this kind of airmail cover. There are two main catalogs that list them - The American Air Mail Catalog which includes those that are from within the U.S., and to and from U.S. possessions, and flown on U.S. airlines to and from the U.S. The second main catalog of them covers the rest of the world and is the two volume catalog called Recovered Mail, Vol. 1 – 1910-1936 & Vol 2 – 1937-1988, by Henri Nierinck. Prices are all over the place but in general it is not a collecting area for those with thread-bare wallets as many can easily go for well over $100 each. I do not collect world-wide ones so I do not have the Nierinck catalogs and do not follow their sales prices so I do not know if this example is a $15 one or a much more expensive one. Having the auxiliary marking and signs of the crash (singeing around the edges) is a plus on this example. Most collectors like to have such indications that the letter was affected by the crash. Sometimes instead of an auxiliary marking a cover will be in an official post office cover to keep together the remnants of an especially damaged crash cover. Perhaps the most desirable and expensive crash covers are the ones that were recovered from the wreck of the Hindenburg Zeppelin.