WWI commerative letter opener

I am a Picker. My Wife and I travel all over the USA for fun and profit I acquired this item at an auction in up state NY in a box that had a few pins some Campbell's kids spoons and forks circa 1050's There wasn't very much in the box and even though I inspected it before I bid on it, for some reason I didn't notice the letter opener. apparently neither did anyone else because I don't think I would have won the bid for the small amount I did.
The item is Sterling Silver and I researched it's purpose I only found one other after about 4 hours of web surfing and it was brass. What I did find out from different blogs and research is giving letter openers or purchasing them was a common thing going back a couple hundred years or so.
This unit is from WWI and it is engraved Camp Wadsworth , Spartanburg, SC on the blade. There is a soldier in WWI uniform on the hilt and he is standing on a shield that says PLURIBUS UNUM under his boots on the shield above the Latin inscription are 5 stars. On the back side inside the shield it is inscribed Sterling and has three small stamps that I'm pretty sure are from the silversmith that made it I dn't have the knowledge myself to know who that might be and I didn't pursue it. The Item is 8 5/8" tall and 7/8" wide at the infantry mans shoulders.
Camp Wadsworth was a tent camp that sprung up almost overnight when war was declared by the USA against the Axis At the time the Us called up the National Guard and NY State had a very large National Guard militia. So they were stationed at Camp Wadsworth Because it was large enough to handle a brigade and NY's National Guard was large enough to man it (30,000 troops) throughout the Great War our boys would go to Wadsworth and do their few weeks of training and then be thrown directly in the trenches. of Europe. they suffered great casualties but just as in WWII they were the beginning of the greatest generation that our country has ever known, most of them in both conflict were boys 18 to 20 years old and they didn't know the meaning of giving up they really were fighting for freedom and a way of life they believed in enough that the price of death wasn't to much to pay. Now in Spartanburg at the site of Camp Wadsworth it is Suburbia complete with corporate America's malls, fast food establishments and I'm sure many politically correct people living their lives and enjoying the freed0m we all have. I wonder how many know that where the live was where those boys learned about artillery and trench warfare and lost lives for that freedom they enjoy. I usually sell the items I pick up because that is how I make my living but when I hold this and look at it all the things I have written come to my mind and I cannot part with it. I guess everyone has something that represents all the things the USA should stand for. For me they are all wrapped up in this little letter opener.