The KNOWLE'S/INSECT DESTROYER comes in two sizes (4 1/2 and massive 8 1/4). The 4 1/2 comes with three different lip finishes. It comes with a flat tooled lip, beaded lip and a blob top lip. The 4 1/2 tooled lip bottles are selling in the $20 to $25 range at the present time. I have no clue as too the value of the massive 8 1/4 size. The 8 1/4 has the address of "No. 7 Sixth Avenue/ New York" embossed under the name "C.N. Crittenton "on the side of the bottle. Maybe Caldig 2 or some bug bottle collector out there can provide us with price range on the 8 1/4. Too my knowledge this bottle comes in the color of aqua only.
In 1873 Knowles advertised 25cent 50cent $1.00 and $2.00 sizes so there is one size I havent seen still out there.
I would guess the small one was a quarter , the 6" was 50 cents, the 8" was a dollar, dont know what the $2 was but would like to see one.