The price range you reference is more in line with brand new swords. the decoration of these blades is done by etching and not by engraving. $300 is a lot for what generally moves on the auction sites and a good bulk of dealers. There are exceptions to this and some varieties of this sword (1902 sword for all officers) can be quite fancy. The source and or maker name can make a difference in value as well. An owner etched name on the blade can both increase or decrease the value. A package of the owner's information for an important figure can greatly increase the value, while an unknown and named blade can sometimes devalue a sale's listing. The truly desirable examples of these are often the very early ones. Condition, condition, condition. The expensive presentation grades of these with the eaglehead pommels with garnet eyes can do well and reach into the four figure range.
In general, a WWII era sword in good shape without extras would be lucky to reach the low end of your pricing. I know of several examples I see while browsing that are exceptionally clean and intact from the 1930s-1940s that are priced around the $250 range. Add value for an original bag/case from the retailer and any sound historical research for the officer. Add a far bit more if you have the hangers, belt w/buckle and other uniform items.
Honestly watching an auction list such as Ebay and dealers offering the 1902 model swords will lead the way. General wholesale price/value is going to be less than $200.
Cheers
GC