DF Loop covers

Hi
I worked on many Mk 1 – 11 – 111 -& 1Vs in world war 11 & saw many of those A/C fitted with the clear perspex cover, the A/c in question still bears the fixing position & marks where the cover was once fitted.
Nice to see the pic, which you posted, but I have never see that type of fitting before.

regards

Dustyone