It's an illustration of Scott 65.
Here's an illustration of an essay from the Lakeshore collection auctioned by Siegel, lot 1099E described as "National Bank Note Co., 3c Black, First Design, Die Essay on India (65-E15c; formerly 56TC1). Reduced to stamp size, intense shade, filled thin at top, appears Fine"

Note that the finished stamp has extra ornamentations around the edges