Proof silver quarter errors

[Makesnocents]

In the case of silver state quarters I opened most of the South Carolina silver quarters share the same doubling it's very much not what I would expect from proof sets what kind of doubling is it thanks again for all the help 

[DWLange]

That appears to be simply strike doubling, which is not a variety and carries no premium, but the photos aren't clear enough to be absolutely certain.

[JKK]

I agree it looks like mechanical doubling. OP, here's what to look for: a true double die is the result of an error in making that die. Every coin it strikes will show the doubling effect, which will be more extreme at one point on the coin and then fading toward its opposite side. Mechanical doubling happens when the planchet moves during striking, for whatever reason. I'm not sure if proof coins are struck twice nowadays or not, but that seems to me to offer a lot of potential for a mechanical doubling.

Thus, with a double die, you look for a second truly raised ghosting image of devices. Mechanical doubling means a sort of shelfy shadow, not raised, of the coin's devices. If you find a good image of the famous 1955 double die Linc, you will be able to see the difference--especially on the date, which IIRC is at the part of that coin where the divergence from proper centering is greatest (more sophisticated analysts than me could look at the coin and tell you how far the die was misaligned relative to the hub, and in what direction).