Crawl space/loft boards fixed with metal?

Crawl space/loft boards fixed with metal?

Crawl space/loft boards fixed with metal?

So, starting to board my attic

There are some boards up there that were placed there during the build in the 60s. Obviously then are just nailed to the joist, with minimal insulation.

However, at one end, it looks like one board has been nailed through a bit of metal protruding from the wall.

Any ideas what this is?
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by Burnsie1983

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