Niels
These strip's were a factory modification designed to protect the hull joint which was found to be a weak point if hit by a projectile.
In the box file at Bovington containing all the Humber manuals you will find a small booklet produced post war describing out the Humber A/C Hulls were made. It describes how one of the three manufacturers managed to strengthen this joint during manufacture without the need for this strip.
Ask Bovington for a photocopy if you are interested. There are not many pages.
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