old american belt buckle

metal belt buckle(copper or brass)titled central&union pacific rail road company,cast scenery-cattle prepared for transport- in relief,on the back marked rare NTY stones Tiffany Broadway New York,in a shield:Property of Union Pacific Railroad Co. period 1920 to 1940?,size 10x7 cm,weight 180 gr.
legend:I bought this item over twenty years ago from an old American collector and well known cameraman .