I couldn't resist not to get this after seeing its condition and price,
so paid $170 including sales tax in Osaka Japan with ext. tube for 1:1.
The optical design of this lens is the same as Bellow Macro 100mm F4
as well as Leica's Macro Elmar 100mm F4, though glass by Minolta's.
See ext. tube > http://www.pbase.com/kkawakami/image/153362002