How can you tell if Heart of the hide is a pro issue?

[RedSoxFan81]

I have a pro issue pro preferred, PRO 12-2K, and know that almost any pro issue pro preferred will have a K at the end of the model listed on the pinky. My question is what specifically denotes that a Heart of the Hide glove is a pro issue glove?? I'm not talking the chicks sporting good type, but the actual true pro issue type glove. Look forward to your replies.