That's called a vice coin. To or more coins are squeezed in a vice or some other method of applying pressure which transfers the design of one coin onto the other. It is easy to tell as the design is reading backwards and is incuse. If it was a real double strike, the design would be positive and raised. This is just a damaged coin.
If the weight is normal, the I would consider it as a damaged coin. If under weight, then look into a bit more to see if it is a thinned planchet error?
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