relatively old with preview switch but clean optics with a hood
It seems hardly used at all, almost mint condition ($75 @2013).
I was looking for MD Macro Rokkor 100/4 for a long time, but
could not resist the price tag of this lens, kinda happy now.
lens manual > http://www.pbase.com/kkawakami/acc_manuals_lens_mc_macro_100mm_f35