Well done.They retailed originally for $100. The original advertising brochure for this knife has photo example No. 0001 on the solid nickel silver bolster. This massive stockman was issued <total 8000> to commemorate the original granting of the historic mark by the Cutlers Guild of Sheffield 200 years previously <actually 1787> If you look at the deep struck Hallmark on the bottom bolster you will see S=Schrade,W= Wostenholm,the Wostenholm cutlery mark <a head shape> plus 0 =1980 production.<the flyer is also dated 1980>.
Your knife would normally be used for photographic purposes I believe however all the IXL flyers I have show the #0001 on all the knives. Still pretty rare find. I have 3 with boxes and bling. <Stainless Steel blades,Solid Nickel Silver bolsters,Brass Liners,Natural Rosewood handles with Nickel Silver shield>.
They are beautifully made quality knives. Hoo Roo.
P.S. How about a photo of your find?