Unfortunately the initials C.G. do not ring any bell
The POB is down the blade (comparing to a modern foil), due to the small pommel, and this is also an evidence of an amateure making. I think the broad shoulders were intended to give more weight up the blade - the same way it was on practice longswords of the 15th c. in order to have a safe flexible blade with good balance similar to a fighting sword's. The length is somewhat shorter then the standard. Nevertheless, the work look of high quality.
Steel guard sabers used to have nickel plating and/or coloring, but I don't know if this used to be a must.