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I think something like this could work better, this is a hebrew leafblade, and the design really scream "Ancient". I think it would fit to showcase that the sword really is ancient, a marvel to lool at without being european in style.
I don't dislike the idea, but I do have some concerns. The maker of that particular blade, Jake Pownings, puts the blade length at 25 inches. It also doesn't have much of a cross guard to speak of.
Neither of these are problems for an early sword, but over time, the weapon would have to be "upgraded" to remain competitive. The blade would have to be lengthened (We could just scale it up to start with to avoid this). More worryingly, however, a new hilt with a cross guard would have to be fitted, making the sword difficult to recognize as the same. In real life, this happened to the "Wallace Sword" leading scholars to first deduce that it could not have been made earlier than the 15th century (the replacement of the hilt and crossguard took place in 1505). In addition, the blade appears to be hammer-welded (as it was already a museum piece in the renaissance, I assume no one expected to ever have to use it) of three separate pieces, leading some scholars to theorize that some or all of Wallace' original sword may in fact be in there somewhere.
You make a good point about classical designs, though, which I brought up in S02 when we were discussing the very first swords of the Noldor. I had suggested that the very first sword they made be along the lines of the khopesh of Egypt. To differentiate the Feanoreans, and to give their heavy infantry a hoplite sort of aesthetic, I suggested the xiphos (Lengthened somewhat. "Long sword of the Noldor" and all that).
In our adaptation, Fingolfin breaks his sword (the first Elvish blade manufactured), and later reforges it to a straight blade, Ringil.
The problem with classical swords isn't one of aesthetics. They look great. It's one of technology. Some of these swords (Narsil, Glamdring, Orcrist for example) are going to be in use right through the Third and Fourth ages. Either they have to be usable in their original form, or we have to be ok modifying them over time, risking confusion for the audience.
EDIT: I don't know why I thought this was on the Narsil thread.