WW2 ROF Front Line Duty printed cloth overall badge

An original late wartime utility restrictions Royal Ordnance Factory badge, printed on blue square cloth, golden yellow lettering 'ROF' with 'Front Line Duty' scroll superimposed over crossed shell and bomb, originally intended to be sewn onto the front of an overalls, but this one is mounted and sewn onto a stiff circular backing with safety pin fitting, presumably to enable it to be switched to another garment.
Very good condition, colours remain bright.
Diameter 48mm.

Code: 52390