| Tail Number / N-Number | N10721 |
| Manufacturer | SIOUX |
| Model | COUPE 90-B |
| Year Built | 1933 |
| Manufacturer's Serial Number | 401 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Engine Manufacturer | WARNER |
| Engine Model | SS40&50 |
| Engine Type | Reciprocating |
| Number of Engines | 1 engine |
| Horsepower | 90 hp (67 kW) |
| Average Cruising Speed | 76 miles per hour |
| Type of Registrant | Corporation |
| Owner Name | ANTIQUE PRESERVATION ASSOCIATION OF GREENFIELD |
| Street | PO BOX 31 |
| City | GREENFIELD |
| State | IA |
| Zip Code | 50849-0031 |
| Region | Central |
| County | Adair County |
| Country | US |
| Fractional Ownership | No |
| Airworthiness Classification | Standard |
| Airworthiness Date | 1977-07-29 |
| Certificate Issue Date | 2007-01-09 |
| Last Action Date | 2021-11-15 |
| Expiration Date | 2029-04-30 |
| Status | Valid Registration |
| Mode S Code | 50020555 |
| Mode S Code Hex | A0216D |