Mine does not have 3 lines ...My 4506 has a dubious past.. I was told that the LAPD officer shot someone with this gun, then he was terminated..He sold the gun to a pawn shop, where I got it.. Looks like he was reinstated at some point. I was current law enforcement at the time and talked to around twenty officers to see if anyone knew him to no avail. I was able to find out that he qualified with the gun at their academy range as they did have record of the gun/serial. I did call S/W and they gave me the build date on the gun.