Roland,
Thank you for closeup of the handle. It helps a lot... now, the bad news...
as A.alnakkas and Ariel noted, it is not Mamluk, Ottoman, and not 17th Century. The handle is recently added. the blade is of old indian tulwar or pulwar as noted earlier. please do not estimate the age of the blade by condition, nicks and pitting.. this is only indicative of how it was stored and cared for. the metal can look very old very fast
Similarly, try not to compare to other
so-called Karabelas on Internet. Comparing shapes and general profiles is wrong way to study, it takes way more. One can call it "Mamluk sword" of course, but this would be only indicative of its shape, not historic authenticity... not the best way to study and collect ethnographic arms. again, sorry for bad news, but that's the case here.