schematic for TrickrTreat door kit, aka schematic for TrickrTreat door kit

A complex electronic schematic showing how to make a TrickrTreat door bomb kit.

It tells you how to make a TrickrTreat door kit with the following components:
1 - landmine
2 - steel pipe caps
1 - relay
2 - capacitors
Making this would take good familiarity with craft.
In the upper right corner is a note: 'First discovered by Dr. mechanic.'

It weighs about 100 grams. It is a electromechanical schematic. You have no idea what it might be worth.