I'm going to have to disagree, speaking as the former kid who actually ground down a broken epee blade. To me, it's chevron-shaped in cross section, but I agree that the pictures are less than informative
In any case, Queequeg will have to answer what the cross-section is, especially near the base.
Here's a modern epee (
image source) for comparison. Unfortunately it doesn't show the critical part where this blade was sharpened down.
Best,
F