Nearly entire production of First Model marked "Eagle Co.". Reason for this marking unknown. Four distinct variations of this model.

Has no integral loading-lever assembly. Has a thin top strap. Only 100 manufactured.

Similar to First Variation, with an integral loading lever. Approximately 200 manufactured.

Similar to Second Variation, with 3-screw frame instead of 4-screws. Loading lever also modified. Approximately 500 manufactured.

Has rounded frame and safety notch between nipples on rear of the cylinder. Examples noted marked "E. Whitney/N. Haven". Approximately 700 manufactured.

Features more robust frame, with brass trigger guard. Barrel marked "E. Whitney/N. Haven". Cylinder pin secured by a wing nut; has an integral loading lever. Approximately 1,200 manufactured.

Has six improved safety notches on rear of cylinder. Approximately 10,000 manufactured.

Improved Colt-type loading lever latch. Approximately 2,000 manufactured.

Similar to Third Variation, except cylinder marked "Whitneyville". Approximately 10,000 manufactured.

Has a larger trigger guard. Approximately 4,000 manufactured.

Has larger trigger guard. 5-groove rifling instead of usual 7-groove. Approximately 2,500 manufactured.