This is a production made Klingon belt buckle produced for the film Star Trek VI - Undiscovered country. 

Originally intended for the Klingon costume for the courtroom scene.

Unpainted and cast in white polyurethane plastic. 

This comes with a COA stating its use in the film, signed by the owner of Global Effects.

These are surplus or used parts from the company Global Effects Inc., the world class Hollywood specialty costume house, know for their high fidelity costumes. Started in 1986, they have produced replica spacesuits and armor for hundreds of Entertainment & Museum projects over the past three decades. 

Global Effects continues to supply props and costumes to the entertainment industry, but is doing some "house cleaning", so you get an opportunity to obtain a little of their Hollywood work from the folks here at Orbital Surplus. 

Here at Orbital Surplus, we collect odds and ends from anywhere in the galaxy. So depending on what empire has collapsed, space freighter has crashed or Transport "got lost", we never know what we will receive next. However, we have lost our lease on the asteroid we have called home for more than 30 solar cycles and have to move. So we are finding stuff we forgot we had, and this is where you luck out, cause it all has to go!