This Springfield Armory manufactured late variation cam latch thumb piece is for the later model 1873 trapdoor rifle and carbine and is in very good condition exhibiting a grayish brown patina with light wear and rust staining.  (file photo)

Note: trapdoor rifles and carbines with serial numbers above circa 67,000 were manufactured with this style cam latch thumb piece. 

Note: U.S. Springfield Armory model 1873 trapdoor firearms with the following serial numbers have been observed with this part: 89587 & 130964