Ohio Metal Detecting

This is my second Civil War era token for this year.  The "Union" and shield definitely date it to the Civil War era.  I am really intrigued by the details in the shield, which is seems to have been hand engraved on the die (opposed to stamped, as the other elements of the design) - the upper points are not symmetrical.  This token is additionally interesting because of the small circular clip in the side of the planchet.

The other side says: "W. Johnston * Die Sinker - Cin, O."  Other tokens are cataloged with this die/maker, but not in combination with the "Union" side.  The ones I have seen have a Masonic symbol.  I have written to Russell Rulau, author of The Standard Catalog of United States Tokens 1700-1900 to see if he can shed any light on this variety.

My searches in the 1860, 1870 and 1880 Census records have not turned up our die maker Johnston. Maybe his name can be found in some Cincinnati City Directories of the era. Another token is seen with an Indian head design dated 1863.  The advertising side is a different design and gives an address of 154 Everett St.