It occurs to me that there may be custom grip makers that can build a set of grips.
They usually need to have the pattern if not the gun itself.
Someone must be able to make original Colt 1860 grips but finding out who would require some investigating with people in the know.
There's always a greater risk sending an antique gun to a private individual grip maker who doesn't have the sterling reputation that an established company has.
Another option is if you have a 2nd set of grips, to build up one set using wood paste, epoxy or filler products.
Some are better than others.
The old Hammerli Grip Paste was a well known 2 part wood epoxy.
I read that it was replaced by Morini Grip Paste which is basically just like brown colored Bondo, only a lot more expensive.
There are other products to build up a grip, but the results can vary.
Some are as hard as JB Weld and a different color than wood.
But a person [especially target pistol shooters] does what they need to do to make the grip fit & function satisfactory.
Someone did post that "eagle grips makes beautiful grips for C&B revolvers.
It's more expensive, and you may have to send them the gun, but they do beautiful work.
www.eaglegrips.com "