Laban Tayo, thank you so very, very much!!!
I am really glad that Katana revived this thread as the discussions on tulwar use, hilt size with reference to Indian warriors hand size and the 'Indian ricasso' have always proven most interesting.
Katana, your extremely well placed reference taken from the Wikipedia reference gives some good support to the hand size element! It seems that the original reference actually comes from Brian Robson ("Swords of the British Army", 1975, p.57), where he discusses the modified version of the pattern 1908 cavalry sword adopted by the Indian Army in 1918, "...the hilt generally was much smaller to match the hand of the average Indian trooper".
I think that statement also supports the excellent observation noted by B.I. concerning many Hindu hilts made very small and with enlarged guards that would not allow the extension of the forefinger outside it.
Fernando, this brings me to your also well placed observation, that the discussion of the possible practical applications of the size of the hilts as well as the use of the ricasso and extended forefinger are in many cases entirely different.
Your analogy concerning the Sinhalese kastane is a very good example of vestigial elements and design on a weapon. The drooping makara head quillons that in design, eventually touched the opposing sides of the blade, completely disregarding the earlier intent of such quillons for protection of fingers clearly illustrates lack of understanding of original purpose.
I think that the tulwar hilt, indeed often of smaller size, may have well fit the hands of many Indian warriors. However, it seems odd that a ricasso would be required on the cutting edge of the blade, unless possibly it simply acted as a choil in the sharpening of the blade? If a warriors hand was in fact, too large, or if a firmer grip for a more solid hit was preferred, the wrapped finger would seem to be ideal. Since parrying was with the dhal, the danger of the opponents blade against the exposed finger would seem unlikely.
I still think there may have been some influence in earlier times when observing the swordsmanship of the Portuguese, in turn very much in parallell with that of the Italians, whose fingers did often coil around the rapier blade.
Although obviously speculation, it simply seems an interesting possibility, but admittedly it seems that further hilt development should have occurred to concur with the ring guards of the rapiers used. Again, to agree with what Fernando has noted, perhaps the purpose of the guards did not seem apparant, so did not integrate into the local hilt design.
While the ricasso, finger curl issue would seem to remain inconclusive, it seems supported that the size of the hilts was indeed to better accomodate the typically smaller hand size of most Indian warriors.
All best regards,
Jim