Up for sale is the Indiana Sesquicentennial Medal produced by Medallic Art Co. It is a .9994 pure silver coin. Written data has this at 4.4 oz to 4.6 oz. I weighed it and it was 140.6 grams. That would be 4.52toz so that fits. The Silver one is very rare - many bronze or small silver from Franklin mint. Heavy thick medal at 2.5" diameter. View pictures provided. Shipping basis to the lower 48. 58 years old.