The double-dagger fighting style of Chinese seems somewhat unique... using daggers with leaf-shaped blades, points directed downwards... however I believe the reason why it was not the most emphasized weapon was because spears and swords were just as common in street fights and have much more range and power than small daggers. Knives were back-up weapons, last-ditch weapons, or assassination weapons... I think the term is "secret" weapons.
Wasn't Fairbairn-Sykes dagger based off the thugs' daggers he saw in Shanghai?
Whether documented or not, the Imperialism in Asia led to a lot of cross-cultural exchange, perhaps the knuckle-dagger was inspired off Chinese daggers... maybe off Bichwa... or perhaps just an evolution of the knuckle-duster... just as the end-spikes and/or blades on the bagh nakh were developed to enhance it's versatility (and some bichwa had loops and claws attahced to do the same from the other end).
I feel as though there is a lot of Chinese weaponry upon which light can be shed... the close-quarters weapons and training of them seems much less known compared to the four main Chinese weapons of the battlefield (qiang/spear, gwun/staff, dao/saber, jian/sword)... which don't seem to include what was very prolific - crossbows, bows, and arquebus
none of which I've seen being used against me or another....
From a martial artist's stand-point, some of these more obscure Chinese close-quarters fighting weaponry would be most useful today, where the big weapons are often illegal to carry, making the handgun, knife, and club the more common weapons... The same can be said about Indian close-quarters weapons (of which less is known outside of India) like bichwa, bagh nakh, and katar which seemed to have been overshadowed (in terms of emphasis and glory) by khanda, tulwar, spear, and pata...
Thanks for continuing this discussion with me.
I can say for sure that I'm learning quite a bit here!