the trapdoor model...................
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
You'll need to post a model number for the gun
Browning began business in the year 1880,selling only one model which was the Model 1878 single shot rifle.
In the year 1880.It was the model 1878 single shot rifle.
the model is written on the gun. THEN check with serial number.
The model number is usually engraved on the barrel .
No such shotgun model number/
The model number is usually engraved on the barrel .
A Model 64
Impossible to answer.
By model, caliber and serial number.
By the serial number and the model number. See the link below.