When I posted up some of the bits today I used this to lie the kit on. I've had it for a long time but have no idea about it. I'd assumed it to be 1960s but can anyone tell me more please ?

Flak Curtain?

It is a quilted steel lined "curtain" as labelled above. It's about 1 metre 25 cm long and approximately 75cm wide.

Thank you for looking.