That type of portrait coupon was used on the Consolidated Five-Twenty Coupon Bonds of 1864.

They were dated July 1, 1865, July 1, 1867, August 15, 1867 and July 1, 1868.

Coupon bonds were issued in $50, $100, $500, and $1,000 values. (Registered bonds, $50, $100, $500, $1,000, and $5,000).

Interest 6 per cent; payable 1st of Jan. and July. All bore the engraved signature of S.B. Colby.

Jerry's image appears to be an unused essay as it is blank where date goes.Colby did not appear on issued bonds.

Chris adds:

To read the earlier E-Sylum article, see:
: Query: S.B. Colby Image on U.S. Government Bond(https://www.coinbooks.org/v24/esylum_v24n27a12.html)