I had one excactly like that. It was given to my grandfather many-many years ago. My research turned up the fact that they have very little value. There are millions of bayonets out there. Some dealers sell bayonets by the dozens or hundreds for just a few dollars each. I had a CW sword that I sold to a dealer, we couldn't quite make a deal on what I wanted. I ended up sweeting the deal by tossing in that bayonet and another of a different style. More a curiosity than a valuable antique. There are just too many around. At some guns shows you will see, literally piles of bayonets for sale.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire