I wouldn't bet on that....
Besides, The comical nature of this post, im going to have to call shenanigans on that, and heres the reason why...
Simple Science (with a little algebra thrown in): your claim is that your sword is 48.5 pounds... Density is a way of expressing how much an object (of a certain size and of a given material) weighs. The size of the object is expressed in terms of its volume. Volume is the size of an object as measured by its length, width and thickness (or height) and is expressed in cubic inches. Written as a mathematical equation, it looks like this:
V = L x W x H.
One cubic inch is one inch long by one inch wide by one inch thick.
For the purpose of this discussion, we can use a simple three-dimensional rectangle to represent our sword. Let's pick your swords dimensions with an overall length of 78.74 inches (roughly 6.5 feet) and a general width of 15.75 inches (thats 1' 3.75 inches at the widest part of the blade). We'll get to the height later.
Swords were made of carbon steel, which has a known density of roughly 0.284 pounds per cubic inch (lbs/per cubic inch). If we know how much weight we have (in this case "48.5" pounds), we can figure out how many cubic inches the object would have:
48.5 pounds divided by 0.284 (the density of steel) = 170.77 cubic inches (the volume or "V" of a 48.5 pound sword).
Our sword is 78.74 inches long, 15.75 inches wide and "H" inches thick, thus: V = 78.74 x 15.75 x H. Using our volume of 170.77, we can solve for H for which we get:
170.77 = 78.74 x 15.75 x H
170.77 = 1240.16 x H
H= .13 inches (170.77 divided by 1240.16)
This means your sword is 78.74 inches long, 15.75 inches wide and .13 inches thick along its entire length. That's not a sword, its a piece of sheet metal, and at that length holding it by one end would cause the other to sag by the sheer weight versus the overall thickness. Then if you take into consideration the thickness of a handle, and a cross guard, the thickness of the blade would decrease to below .09 making it about s thick as a standard us dime if not thinner.
I'm afraid I'm going to need proof of this claim good sir, because without it, the science says that your claim is a falsehood.