When it came out it was *$17.00*
The model 1873 Colt Army .45 revolver was about $17.00.
The Sierra Six looks like a ruger single six- or a colt peacemaker. Basically it looks like any pistol you would see on an old western movie. A good- low cost shooter....
Proofhouse.com has sn tables for Colt you can look at to see when it was made. You could get a letter from Colt, but, that will cost @ 100 USD.
No such weapon made by Colt
The automobile did not exist in 1873. 1886 is the birth date of the automobile.
About $20
It depends on what caliber.
The Colt 25 airsoft BB gun cost between $10 - $15 depending on the model.
You could get a historical letter from Colt. Cost is about 100 USD or so.
Cost, caliber and maker.
165
A letter from Colt will cost you @ 100 USD