on top, behind the loading gate, next to hammer
Your serial number indicates that your Springfield trapdoor model rifle was made in the year 1887.
about 1886
There are no model 1878s. You have a model 1873. Check out www.trapdoorcollector.com for more info.
Your trapdoor was made in 1884.
According to this proofhouse website http://proofhouse.com/colt/index.html the model 1878 was only made up to 1905 with the final serial number being 51210. I don't know how much your gun is worth but with a serial number 117187 it is not a model 1878
The Colt 1878 frontier model with serial # 35369 was produced around 1896.
made about 1881
the trapdoor model...................
made in 1887. caliber 45/70. vlue depends on overall condition. anywhere from $300 - $900 +
If this is the Colt 1878 Frontier model serial # 5100 , then it was produced around 1881.
value depends on the pistol model, overall condition and serial number. If a good early model single action, value could be $1500 - 2500..............................................
I am the one asking the question about the springfield us model 1878 and it's value. I have (2) in very good shape that i acquired a while back and would know the fair market value so when i decide to trade or sell them i can be on an even playing field. you van e-mail me at ira003@centurytel.net thank you.