I posted this knife in the "Your latest Schrade" thread when it was still in the mail. I figured a knife that looked so badly tarnished had to be sterling. Black gunk had to mean 80 year-old goodness. Seller didn't recognize it as such so I was taking a chance but at $20.00 it seemed well worth it. Now that it's arrived and has been cleaned the mystery is solved. "I love it when a plan comes together!" to quote the old A-Team. I gave it a Flitz, soap and water and WD-40 treatment and the results are making me smile. "Where's Waldo?" Can you see a "sterling" stamp in these, the seller's, pics? I sure couldn't and believe me, I looked. Some pattern info: The 7709GOLD Shac is described and illustrated (this is the gold-filled version and pic shows "M" version with manicure file) in the 1936 Schrade Supplement to Catalog E. The M7709SS Sha ("SS" means sterling silver) is on the 1932 price-list and you could likely get the 7709SS Sha with spear and pen blades at that point as well even though it's not on the list. The "Trade - Mark" engraving, which magically appeared after polishing, makes me guess this is a factory SFO or maybe done post-factory by Coke themselves as only Schrade and Coke would bother with that legality. The engraving is deep and crisp. I like the different patterns on the front and back of knife. Classy! My 2-7/8" knife is indeed full crocus (mirror) polished, cleaned inside and has brass liners. You can see the brass liners in the "easy-open" cut-out areas if you look closely. It's a thin single-spring knife. I think I have deciphered the model number right. Please correct me if you see a mistake. The scanner doesn't capture this knife well. It's way to shiny to scan and everything gets that dark tint but I hope you get the idea anyway.