I agree with Robert; it's a pre-pattern British sword dating to around the 1780s. The Crown over G could be for Thomas Gill; I believe that he used a stamp like that before 1800.
If you search the Royal Armouries online catalogue, you'll find several examples of similar-looking swords described as "Light cavalry trooper sword". Although they have langets and the blades are different. You may also want to consider that the blade on your sword has been shortened.
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