Hi Carlos,
Marsh Bros. & Co was a Sheffield-based cutlery manufacturer who was in business from 1850 through 1947.
While speculative, from the hilt form and scabbard, I would estimate your knife dates from the early-to-mid-3rd quarter to early-4th quarter of the 19th C. Interesting wavy-bladed form, which I would have to think must have been rather uncommon during this period.
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