Outstanding Manuel!!!
Most definitely has all the elements of one of the swords that this information suggests were produced in some number in Boulton and associates shops around 1770's to 90's. Since he was a silversmith, quite possible to be silver but Im not well versed in metallurgy so cannot say whether that or another metal might be in the pommel.
It is exciting to see smallswords that can be attributed not only to a fairly tight period, but potentially to a maker or in this case, a school that is so closely linked to the industrialization and mass production in England.
One thing that you mention that I consider most intriguing is the blade having a notch to increase severity of wound. This feature is present on numerous sabres and cavalry swords in Europe, and is seldom observed. It seems to be a strictly 18th century practice, and its effectiveness in accomplishing its presumed purpose has been considered questionable. What is most puzzling is why a notch would be placed in the blade back near the tip on a cavalry sabre, which was used in slashing cuts, not thrusts. It is true that some cavalry attacks involved thrust from high tierce, as I understand, but this was the exception, and a notch would seem to increase the potential for the blade becoming lodged. In any case, an interesting subject.
Thank you for posting this example as well. I agree with avoiding too much cleaning...the patina is to me embodied history
All the best,
Jim