How can you tell if a Dayan 2x2 is OP?

[Skewby_Doo]

Just wondering how to tell if a Dayan 2x2 is old plastic. I have heard that you can tell via screw color, but was not sure if this is always the case.

 

[abunickabhi]

Just look at how to puzzle turns and feels.

If you are aware of how the OP felt like you will instantly identify it yo.

 

[Bingus Ringus McDingus]

Black screw, lighter-colored core, a louder sound. That and the fact that it's incredibly marked-up on price.