"Krztalizer" == Krztalizer writes:

Krztalizer The certificate commemorates a record ascent to 21,430
Krztalizer meters by an English Electric Canberra B. II, WK163,
Krztalizer crewed by Michael Randrup and his observer, Walter
Krztalizer Shirley, on "28 Aout (?) 1957". The location is
Krztalizer either Suton or Luton aerodrome. The certificate has
Krztalizer begun to fade, beginning with the signers, the
Krztalizer president of the FAI and HR Gillman, the Secretary
Krztalizer General of the FAI.

Aout (with an accent) is French for August. Sutton or Lutton perhaps?

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G Hassenpflug * IJN & JMSDF equipment/history fan