| Tail Number / N-Number | N4121F |
| Manufacturer | CESSNA |
| Model | 172 |
| Year Built | 1958 |
| Manufacturer's Serial Number | 46021 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 4 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | CONT MOTOR |
| Engine Model | 0-300 SER |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 145 hp (108 kW) |
| Average Cruising Speed | 105 miles per hour |
| Type of Registrant | Individual |
| Owner Name | HARROLD BRUCE E |
| Street | 516 8TH AVE N |
| City | GREYBULL |
| State | WY |
| Zip Code | 82426-1724 |
| Region | Northwest Mountain |
| County | Big Horn County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1958-10-17 |
| Certificate Issue Date | 2022-06-28 |
| Last Action Date | 2022-06-28 |
| Expiration Date | 2029-06-30 |
| Status | Valid Registration |
| Mode S Code | 51157017 |
| Mode S Code Hex | A4DE0F |