Thanks jpc, crazy_davey and redbirddog--CosmiCIOR.
When I was corresponding with Two Flints I asked him if he could help me with the unit that my Smith carbine was issued to.
"Some time ago I acquired the four volume set of the Springfield Research Service (SRS) Serial Numbers of U.S. Martial Arms. I purchased the set so I could help SSS members identify which unit their original Spencer Carbine or rifle was issued or assigned to during, and perhaps, after the Civil War. "
Two Flints answer;
"The SRS books don't have many Smith serial #s listed - closest serial # to your 21198 I found is - 20097, a Smith Carbine issued to Company C, 11th Illinois Volunteer Cavalry on July 27, 1864."
In 2002 I had the research person at The Horse Soldier in Gettysburg do some research on C. H. Duba which is stamped on three places on the stock of the Smith carbine.
Interesting that SRS records S/N 20097 Smith carbine to the Company C, 11th Illinois Volunteer Cavalry and the name stamped on the stock of my gun S/N 21198 shows (C.H.Duba) there was a John C. Duba who was with Company C, 12th Illinois Cavalry. (Duba is a bit of an unusual name)
With the difference in the serial numbers 21198 (mine) and 20097 that you found in SRS, I suspect that my carbine might have been issued to Company C, 12th Illinois Cavalry.
One of the puzzling issues that I had was the vet 's name was John C Duba and the name stamped on the stock of my carbine is C.H.Duba.
My research on this carbine dates back to 2001.
When The Horse Soldier was doing the research they were researching the Duba name without any regard to the Smith carbine and SRS tracks the serial number and where the arm was issued. They only found three Duba names---John Duba was the only cavalry vet she found.
Company "C" 12th (Consolidated) Illinois Cavalry
Company "E" 12th Illinois Cavalry
DUBA, John Private St Ann Feb 28, 1862 See Co. C, as consolidated
DUBA, John Private --- --- Mustered out Dec 31, 1865
It appears that John Duba survived the war.
Serial number 21198 on my Smith carbine.
JM cartouche --perhaps for John Magg's.
John Maggs, active in 1862, during the American Civil War, accepted firearms and accessories on behalf of the Federal Army.
I don't know!----this a cartouche on this Smith carbine.
David