I picked up a used Benchmade 750 sbt and I am trying to determine the vintage. I know benchmade redisgned it slightly during the production, making the locking bar thinner. I would also like to know if the blade is ats-34 or 154cm. The blade steel is not marked on the blade. It has the older Benchmade logo with "Bali-Song" across the butteryfly. I am assuming it is an early production model with ats-34. Anyone have any insight or pictures of the different vintages. Thanks in advance.