I just see the design flattening towards the rim. You can see similar flattening on LIBERTY. Quite similar to Peace dollars - they flatten at the rim just like this.
The "3" tells me there was an issue with grease in the die at the time of your strike. The slight amount of grease in the makes the devices look wider, but they are tapered to be able to release after the strike. The slightest amount does affect the devices.
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