I was also wondering what my Nakamae Type - S black synthetic leather and red thread are worth these days. They are in pretty much brand new condition aside from a small little scuff, but i'm sure it can be easily fixed. Knowing that it is really hard / near impossible to get Nakamae to make you a new set and they rarely come up for sale, its really hard to price them.

I am curious to what you might me asking, I have a friend with a nice 510 sedan that has been interested in possibly mounting a set of these in his car.