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.