Judges may wish to consult Metalwork criteria for standards on techniques. Most period instruments were variations on horn or trumpet. Many variations affected only appearance. These may be documented with period illustrations and construction details documented from standard pieces.
Slide trombones are period.
OR is an exact reproduction of a period item. Evaluate the work as a whole. Most period instruments were variations on horn or trumpet. Many variations affected only appearance. These may be documented with period illustrations and construction details documented from standard pieces.