I just picked up a Benchmade 732BT PE Ares NIB and have a question regarding the coating on the blade, from what I have gathered from the seller they advised BT coating was only offered from 2004-2005 and then switched to BT2 coating, and this variation is rare.. can anyone shed some insight on the differences between BT and BT2 coating? BTW this is my first Ares I am adding to my collection and have been wanting a 732 for a long time.. Glad I finally found one! 