bigted,
Here is a (slightly out of focus, sorry) photo of the front sight on the short 1860.
I have done simialr to other C&B revolvers and even a few Model P clones. Why have a revolver that doesn't shoot to your needs? Yes, they were done during the original era. Not to every revovler but to enough that you can find one if you look. Same with short barrels. Some (few) left the Colt factory with other than 7 1/2" or 8" barrels but many were shortened by the owners. but most were left as made by Colts.
And please do not believe the C&B revolvers were retired in 1873. They were in common use by civilians much later than that. Many were converted to handle cartridges also. The Model 1873 Colt was sold mainly to the Army, few civilian sales were made in the first 5 or so years. So if you wanted a handgun, you had two choices, C&B or conversion. And the conversion was less expensive than buying a whole new revolver. That may have been a consideration when the average cowhand made $1 a day.
There was alaso a special dovetailed sight I made and installed on a Model P. I made the sight with very long base wings and after sighting it in I rolled the wings down and cut them so they met under the barrel. A touch of solder and it looked like a banded front sight. A fellow shooter liked it enough he convinced me to sell it to him. Wish I had a photo of it.