It is referred to as a Khandjar, another Arabic word for knife or dagger and one applied by Stone to a rather different type of knife. As this example suggests, terminology is not entirely standardized. Some have reinforced points, presumably for going through mail, but many appear to be general-purpose utility knives. One sometimes sees them for sale, at Pennsic and elsewhere. Kards I have seen range from about nine to sixteen inches in overall length.
Typical length is about sixteen inches.
All of these are probably appropriate for late Islamic personae, and very possibly for early ones. Examples can be purchased from arms and armor dealers. A catalog I have from a few years ago lists kaskaras, khatars, jambiyas, pesh-kabz's and kards, with prices starting at about a hundred dollars. In general, antique Islamic weapons, although not cheap, are much more reasonable than their European equivalents. Two Islamic Knives References Arab Painting , Richard Ettinghausen, Macmillan, London 1977.