schematics for a tommy gun, aka schematics for a tommy gun

You see nothing special.

It tells you how to make a tommy gun with the following components:
1 - short steel pipe
1 - long steel pipe
1 - ammunition magazine assembly
1 - firearm trigger assembly
1 - firearm sight assembly
1 - firing pin assembly
1 - firearm breech assembly
1 - pile of scrap wood

Making this would take expertise in craft, good familiarity with rifles, and decent familiarity with science.
In the upper right corner is a note: 'First discovered by Dr. drygonnawin.'
It weighs about 100 grams. It is a gun schematic. You think it might fetch about $2 on the market.