SBA Wrong Planchet 28mm

2 SBA P dollars on the wrong planchet. The SBA planchets are supposed to be reeded and 26.5mm. These two are not reeded and 28mm wide. I assume a foreign coin planchet since no US coins are 28mm. The core looks to be bronze. Anyone know how to determine what foreign coins were minted in Philadelphia in 1978/1979? Thanks.

 

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Hello! What does the rim look like? Pics please?
Pic of the reverse also.

 

@BaconSlayer
Looks to be Broad struck out of collar.
That would make the planchet expand a bit.
No reeding means the 3rd collar was not in place. The core is copper sandwiched between cupronickel clad like all US Clad coins.

Not struck on foreign planchet.

 

Definitely Broadstuck on a planchet intended for a SBA Dollar.

 

Thanks Ed! Always can count on you.

 

It’s on the correct planchet as @paddyman98 explained. It’s a very nice mint error, a Broadstruck SBA.

 

Fun coins BaconSlayer.
The collar never released when the coin was struck. That doesn't have anything to do with a wrong planchet error. All Susan B's are a copper core clad planchet easily seen in your photos. Off center Broad stuck. Here is a centered broadstruck Lincoln.


https://www.error-ref.com/?s=broadstrike

 

Thanks all, great information!