I apologize if this has already been asked, but here I go. A short time ago one of our local sporting good stores had a 30% off sale on all Buck knives. I couldn't help myself and bought a 55 that had a 2005 date and a 309 with a 2004 date stamp. The 55 seems like a real nice pocket knife. I cherry picked from the batch he had and got one with nice wood and a real sharp blade. I am wondering about the history of the 55. How long have they been made? Was there any different steels used? What type of handle material has been available? Any info is appreciated! Thanks!