Mc Nelly rocker balance
Pic  CS 50
Counterfeit coin detector for U.S. gold and silver coins patented by J.T.Mc Nelly and W.H.Harrison on Feb 28th, 1882.The slots in the platform gage diameter and thickness of the coins. Vertical slots below the platform hold the coin in place for weighing. Hard to find with original peg which is needed to weigh the 1 $ gold coin