Thanks to Pohill for posting this photo on my behalf. I sent it to him in hopes of identifying the pistol in the foreground. I'm 90% certain that it's a Whitney, but welcome any evidence that would support either possibility.
The photo is of Matthew Wallace Hall, Company K, 36th Texas Cavalry (my 3rd great grandfather). The 36th operated primarily in Louisiana and along the Texas coast during the war. Here's a link listing known engagements of this unit:
http://www.angelfire.com/tx3/RandysTexas/36thcav.html
As noted in an earlier post, it is quite possible that this was a captured gun. I find it interesting that both pistols appear to have blade sights - which might have been a personal preference.
As to whether or not the barrel is bent - it's possible, but may be due to the fact that the image is a multi-generational copy. The original has sadly been lost, but a distant cousin took a photograph of the original as it hung on her uncle's wall in Coleman, TX sometime back in the 1950's.
I hope to obtain copies of all 3 weapons to display with the photo and regimental flag. The 32nd and 36th Texas Cav both flew the reknown "Bonnie Blue" flag. The Bowie will have to be custom-made. The Colt is readily available. The Whitney (if that is what it is) is proving difficult to locate. If it can be proven to be a Spiller, it would make my search much easier - as repros are still being manufactured.
I'm keeping the complete photo out of circulation - at least until I can acquire a Whitney repro (or until evidence tilts toward a Spiller).
Thanks again to everyone for your input! Keep it coming.
J_M_H