To clarify, my comments above were about swords made in the early Shōwa 昭和 (1926-1945) era and not older swords repurposed for military use.
On this forum, we tend to think more in terms of traditional Japanese sword craftsmanship versus the economical mass production of swords. If one keeps in mind the resurgence of interest in swords in the 1930s and 1940s, one can better understand the need for parts made in quantity (and not quality). I think one is either looking at high end blades and parts made by craftsmen for the wealthy or swords made on an assembly line for the working class with a modest income. In my opinion, these tsuba that are illustrated above and in the links are intended for the working class.
Seki stamped Kanemori in handachi mounts on Yahoo
Inherited Sword, looking for help Identifying maker.