Hi Jacques,
The curtain for the standard, double skin, 'non-demountable' door has a step in the bracket that slots into the bracket on the inside face of the door. The step spaces the curtain so it sits on the outside edge of the door, with the underside of the step sitting on the top flat of the door. With the Aust '44 pattern door, the depth is only the thickness of the frame material, I think about 1/8th or 3/16th, plus its canvas covering, hence the straight, flat mounting bracket visible in your images.
There was a whole raft of 1950s-era CGCF-marked door curtains floating about at one stage (20+ years ago??) I'm reasonably sure that Blitz enthusiasts such as Keith and Euan have examples. These were the stepped design for the double skinned door, but the canvas covering had a smaller plexi? window than the WW2 version.
Mike
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