WHAT A STRANGE AND INTERESTING GRIP. IT WOULD APPEAR THAT WHEN YOU HOLD IT IT WOULD BE LIKE GRIPPING A PISTOL. I HAVE SEEN THE PISTOL GRIP FORM ON MALAY AND INDONESIAN DAGGERS BUT NOT ON A INDIAN SWORD. FROM THE SIZE YOU GIVE IT IS EITHER A LARGE DAGGER, OR A SHORT SWORD. THE WEAPONS I HAVE SEEN USING A PISTOL GRIP ARE USUALLY SHORT DAGGERS AS THE GRIP STYLE WOULD NOT BE AS GOOD ON A LONG BLADE.
SORRY I CAN'T HELP ON ANY INFORMATION PERHAPS THOSE WHO COLLECT INDIAN WEAPONS CAN BE OF HELP. A VERY NICE AND UNUSUAL ITEM.