25 Postcards with following info at the back:
Canadian Forces CL-41 Tutors of No.431 Snowbird Demonstration Team giving a display of precision flying.
In 1969 Col. O.B. Philip Base Commander of CFB Moose Jaw formed an Air Demonstration Team, not an Aerobatic team, No.431. Squadron. 
The aircraft is powered with a single General Electric J85-CAN-40 turbojet engine.