Try oldguns.net
It was made in 1881.
The model 1898 with serial number 487448 was manufactured in 1900. This model refers to the Krag–Jørgensen rifle, which was used by the United States military. The specific serial number indicates it falls within the production range of that year.
You can go to browning.com and the date my gun section to see serial numbers
http://www.gun-data.com/springfield_trapdoors.HTML , this website indicates your 1873 Springfield trapdoor carbine was made some time in the first half 1884. It couldn't have seen battle with General Custer,but more than likely help tamed the Alaskan wilderness. ahhh, what that gun could have seen!
The letter "k" is not used by Browning in serial numbers.
$275-$450, depending on EXACT model and EXACT condition.
The ratio of composite numbers 6,3,4,12,18 and 17 to prime numbers would be 9,15,21 and 25. This is taught in math.
'ser' = to be
Walter Riggans has written: 'Jesus Ben Joseph' 'Numbers' 'Hebrews (Focus on the Bible Commentaries Ser)' 'Numbers (Daily Study Bible (Hyperion))'
There should be more numbers and or letters in the sn. If not, call Browning.
1974. You take the first two numbers of the ser# and subtract from 2000.
Model numbers were not used until 1957.