https://www.rockislandauction.com/detail/69/1127

During the development of the 1860 Army revolver, Colt did consider mechanical options other than simply scaling up the 1851 Navy pattern. One of these, as evidenced by this Colt prototype, was an enlarged version of the 1855 Pocket, aka Root, revolver. That 1855 design used a solid frame and had been the basis for Colt’s revolving rifles and shotguns, and so it would be natural to consider it for use in a .44-caliber Army revolver. How extensive the experimentation was is not known, and I believe this is the only known surviving prototype of a Dragoon-size 1855 pistol. It survives in excellent shape, and is a really neat glimpse at what might have been…

http://www.patreon.com/ForgottenWeapons

Related:

Collier Flintlock Revolvers: https://www.full30.com/video/007209576f7078b7a6365c7e0356cf98

Savage Navy Revolver: https://www.full30.com/video/8467fe8e07abb3ac96b9d10c2a298565

Presentation 1851 Navy w/ Canteen Stock: https://www.full30.com/video/bbd8b48a24f0dd9f730d9a3406b84476

Richards Conversion 1860 Army: https://www.full30.com/video/2150a1c0c98ce83c424035088750d185

Colt 1847 Walker: https://www.full30.com/video/00c9761979a535ee6c947ed10a1e5640

Colt 1855 Revolving Shotgun: https://www.full30.com/video/cef8c4a5ca4e08559aa6494dccd38030