The information below was received from Norm Ratcliffe, with his permission to print it.

 

I have had this plate since early 2002 when a contact with the Pennsylvania State Police told me that PA Official Use plates don't expire, and that even if he wanted to give me an older PA OU plate for my state police/highway patrol license plate collection, he couldn't.

 

He pulled some strings for me at the PA DMV and had this OU sample plate made for me.

From what I understand, it's "one-of-a-kind" as the DMV had never produced an OU sample plate before (or since from what I know).