A "geta-ya" chisel showed up on the front page of eBay for me today; item number 121238494615. A similar item shows up here.
Interesting, albeit something I would have no need for, but I'm curious as to it's form/function. The auction mentions they are used between the teeth of the geta - so are the two long protrusions on this chisel to help guide it between them without scarring them?