Well there can be a bonding if two planchets were struck together:

The weight would be affected. But this would be very rare.


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But on the obverse of your nickel if the rim is flat, then the devices would sanded off. The setup rim should be there if it weren't struck.

Note the setup proto rim that is added to make a blank into a planchet?

So if the obverse is missing the rim, then it was removed. (
PSD)
The weight should be lower than a normal coin if this happen.
