A vintage mid-century Cadburys Cocoa enamel advertising sign

A vintage mid-century Cadburys Cocoa enamel advertising sign.
The colours of the sign are very vibrant and the blue really pops. 
As you can see there is significant rust to the edges and damage to the middle which is reflected in the price . 
We think it would look amazing if it was float mounted in a frame. However to do this a backing board would need to be added to flatten the sign.