The Onyx cornet was produced at the Olds plant from c.1974-1976, replacing the solid nickel-silver Argenta model in the catalog. Onyx models featured a deep black lacquer [aka “black nickel”] finish over nickel-plated brass areas of the horn; the dark ebony contrasted with the polished nickel silver used on the tuning slides and trim areas.
| Model | Size | Description | Example |
| CR-20 | Bore: .468″ Bell: 5″ |
Onyx Cornet | Tuning Aids: First-valve slide hook; third-valve tuning slide stop | Materials: nickel-plated brass with nickel-silver valve slides and crooks | Finish: Onyx lacquer [aka “black nickel”] |  |
Notes and Quotes
1974 catalog:
Designed for the cornet player who desires a dark, mellow tone, the Onyx Cornet is an outstanding professional instrument that has been precision engineered for greater agility and tonal response. Top-loaded, inner-sprung pistons insure rapid valve action that affords immediate response for added versatility. The first-valve thumb hook provides for more precise control on intonation while the five inch bell flare helps project a rich, full sound. This instrument features a pure, deep black Onyx finish with nickel silver outer tubes and trim. Complete with deluxe instrument luggage.