schematics for creating a rebar sword, aka chematics for creating a rebar sword, schematic, schema, rebar, and sword

A soot-smudged scrap of heavy drafting vellum.

It tells you how to make a rebar sword with the following components:

2 - steel rods

Making this would take some familiarity with craft.
In the upper right corner is a note: 'First discovered by Dr. queenbvrf.'

It weighs about 100 grams. It is a blacksmith pattern. You think it might fetch about $2 on the market.