How old a Marlin lever action in 45 government caliber serial number 2727?

Try this web link for the answer to your question. http://oldguns.net/cgi-bin/f2f/f2f.pl?http://oldguns.net/q&a1_05.htm Most likely your Marlin in .45-70 Govt. is a model 1881. These early Marlins were not recoded in Marlin records prior to about serial number 4000, but your's should date to about 1882.