No problem Sidj,
The fullers are not something that can be added in, and four is an unusual number, usually three in multifullers.
The font with serifs is indeed European, but as I say, it is entirely atypical to have LONDON stamped alone and in this manner on the blade.
The long enduring situation with blades coming into the ports along the North African littoral would bring them from numbers of sources, but German, as invariably the case, predominated the markets. Ironically, British blades were not in especially high esteem, so this seems odd. The only exception was with of course ANDREA FERARA, which was associated with the Scots, but with these blades in their own league as far as quality perception.
It would be hard to say, but safely we can presume your nimcha was hilted in 19th century possibly mid or earlier, but with these produced holding to the traditional form for virtually centuries who knows? These blades were in circulation for as many years in many cases, and swords remounted many times through generations.
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