1967 British Penny Very Lightweight - error or something else?

This British penny only weighs about 3.8g (should be about 9.4g.) and is extremely thin. Is it an error or is there some other post-mint explanation for its appearance?

Thank you

 

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I dunno. I know that those large British pennies were worth practically what they were selling for just for the copper in them in the world coins bin a couple of years ago. They were all copper and pretty big coins right up to the end of them in 1967. It should weigh 9.4 gms according to the Standard Catalog.

 

Thanks Revi I located a normal 1967 penny and took a few comparison pics. The edges and also note how the diameter of the "error" coin is just a tad smaller - it is missing the rim.

 

FYI
I posted the photos of this coin over at the Predecimal.com forum and the members there say it is an acid soak post mint creation.

 

They are correct. Nitric, I believe, is the acid of choice.