QUOTE (Indy @ Mar 4 2012, 05:46 AM)
which still means nothing more than it was produced between 78 and 84. Dating a Ripper is next to impossible, and by serial alone, it is impossible as far as I am concerned as I've been trying it for many years. Decals did differ from earliest with 2 gen's on looptails but those aren't stamped into the frame by any means and while drop outs changed on early forks, those can also be changed.... The ability to date a PK Ripper frame requires a crystal ball to get it close.
PK's didn't debut until 79, not 78. So, knock 78 out of the game. A large segment of 79, there were no serials. So, you start mid/late 79 with 2xxxx. There is also additional documentation showing manufacturing of about 11K frames a year. So, it's actually pretty simple if you just project out at about 10K frames a year to get pretty close.
A 5xxxx PK was probably produced around 1982.