Some collectors have attributed the style to the earlier part of the 20th century; others posit
an even earlier period. The 1920s through the 30s saw the spread of the Art Deco movement, elements of which appear in the handle design. Google "Art Deco India" and you will find numerous references to the "Indo-Art-Deco" style, including the Maharaja of Jodhpur's Umaid Bhawan palace, now a hotel. These were intended for a tourist market, no doubt, but early Indian "tourists" were primarily British officers who travelled for reasons other than pleasure.
This same handle style is found on new knives listed on eBay and elsewhere, so dating individual pieces can not be formulaic. The faux wootz blade above appears recently made, while the larger double fullered one could easily date at least to the period before WWII.