The 1992 US Mint Silver Proof Set NB136 is a highly sought-after collection of uncirculated silver coins struck with a proof finish. Produced in San Francisco, this set includes coins with a fineness of 0.9 silver and is certified by the U.S. Mint. With its origin in the United States, this set is a valuable addition to any coin enthusiast's collection due to its high quality and limited mintage from 1992.