Collishaw flew three Black Marias.
N5490, N5492 and N533. Only
N533 was a twin-Vickers Clayton and Shuttleworth built a/c. At least N533 also carried the letter C on fuselage sides and stabilizer and had a black fin as well. Did Collishaw refit N5492 or any other Naval 10 Tripes in the field? Perhaps more knowledgeable formites can confirm or deny this.
VBR