sactroop is correct, and they are hard to tell apart unless you have studied them. The markings have slightly different fonts. The commercial reproductions had the sheath marked with the EGA and USMC, but of course they are easily separated and swapped around.
The WW2 blade marked is not all that uncommon. Using eBay as a baseline, there are at least 6 on right now and that is about average. My PERSONAL method of classification using eBay is: Common: 10 or more at a time Less Common: 5 or more at a time Uncommon: 2-3 at a time Highly Uncommon: 1-2 at a time Fairly Rare: Less than 1 at a time Rare: 1-2 a month Very Rare: 1-2 a year. Extremely Rare: Less than 1 a year. Silly I know, but it does put some of these in perspective.
Gary Cunningham - Bayonetman