Thanks to
RaidersLight over here I was able to finish a personal quest of mine, and I finally found an original Nazca dagger from Crystal Skull by Marto (Charles V Imperial Dagger Model 706, if you want to get technical). And not only that, but a complete boxed one and all, and in Spain itself where this dagger is originally from in both fiction and real life.
Like any Marto blade, I guess you could say this is a decorative, historical reproduction of sorts, certainly a non functional blade, but since it's an object used by the film's team without any need to build it from scratch (other than aging), I'd say it counts as a "Real World Prop."
Now the funny thing is that we found not one, but
two of these daggers at the same time, which is remarkable not only because of how damn rare they are, but also because they were
different. Turns out there are two models of this thing out there, both likely made by Marto in Toledo, although this is something we're still trying to figure out at the moment.
To be clear, I'm not referring to the fan-made replica by—I think—Sarednab, which is a pretty good alternative for this prop. The second variant of the dagger is virtually identical to the one pictured here, minus the Marto logo under the guard. It also features what seems to be an aged, matte finish on the gold details. RaidersLight will follow up this post with pictures of his own dagger for reference. Unfortunately, his didn't come boxed, and since it lacks the logo, we don't know if Marto manufactured it for certain. Still, it's quite possible they did, especially considering some
old store links featuring the dagger advertise it as a replica from the Indiana Jones movies—which the original certainly wasn't, as it must have been purchased by the Lucasfilm props team during production in an effort to save time and money. The fact they bothered to remove the shine from the gold also suggests it may have been a second run looking to capitalize on the movie, since the dagger used during filming was weathered to dull it down.
Pictured here is the screen-used dagger from the Indiana Jones Prop Exhibition in Valencia a few years back. The blade was sharpened and dirtied up, with the "made in Spain" legend under the Marto logo possibly erased. And again, as you can see the red and gold details were dulled down to make it seem more uniform and realistic. Other than that, it's pretty clearly an off-the-shelf Marto dagger.
As for the variant, pending Raiders' pictures, if anyone owns one in its original packaging it'd be interesting to learn more about it so we can have a complete profile of this prop.