No it isn't. Gram was the prototype of Caliburn, which in turn had the prototype Merodach before it, which in turn was based on a nameless sword in Gil's vault.
Caliburn is based on Gram and comes from Merodach: The Original Sin. Both Gram and Merodach are a part of Gil's treasury.
Excalibur is a completely different beast in Nasuverse and, though it looks like Caliburn, it has no real predecessor. Gil could try pulling out Caladbolg but, even in the Nasuverse, only the rumor of relation connects the two weapons.
Excalibur is a completely different beast in Nasuverse and, though it looks like Caliburn, it has no real predecessor. Gil could try pulling out Caladbolg but, even in the Nasuverse, only the rumor of relation connects the two weapons.
The Nasuverse Excalibur could be based on the 1981 movie, where it could be interpreted that Excalibur was the name given to two different swords: the "sword from the stone" that was used at the beginning of the movie, and the one given by the Lady of the Lake when the first sword broke.
Ugh... Other than me having "Blonde hair" and being a "King", everything I have is in common with that man...So that means that even my sword is just a hand-me-down from that man...