hello Kershawians, i'm dropping in from Schrade for a little help. a couple of days ago i purchased (ebay) a Kershaw Blue Mountain 3130; 4 1/8" LB, 2 blades, clip and sheepsfoot. looks like a good knife and a bit unusual to have 2 blades on a LB. i've searched here and at Kershaw website, but can find no mention of this knife. i am not at all familiar with Kershaw knives, so would like to know: app. years of production; upper/lower end of Kershaw products; v. common/rare; steel type ? as well as any other info or experience with this model. thanks, roland