If that is a lightning large frame express, it was the 4th one produced in 1892 (5700-5999)
your rifle was manufactured in 1894.
The Colt lighting .22 rifle with that serial number was made in 1899.
1896
What is the age of a Colt rifle serial SLD25319
http://www.coltparts.com/Dates_of_Mfg.html According to the above website, the rifle would have been made in 1893!
The Sn crosses between 1892/93.
You will need to check the internet to find one in similar condition for a realistic price. the range is from 100 to multiple thousands. Your "fair" could be "poor" or "looks like it was drug behind a truck for a thousand miles" or "good".
The small frame .22 rifle with that serial number was made about 1897 (112 years old) and the medium frame .32,.38 &.44 was made in 1888.(121 years old)
Depends on condition and exact configuration. Value range from 20 USD to multiple thousands of USD.
Try Numrich.com
If your Colt Stagecoach was made from 1965 - 1968 it will not have a serial number.
I OWN #712 RANKINFREDERICKC@GMAIL.COM COLT 45-60-300 HEAVY FRAME LIGHTING RIFLE ALL MATCHING NUMBERS VERY GOOD CONDITION YOU TELL ME WHAT IS WORTH.