Hi everyone!
This is a old K mount Asanuma 200mm f/3.5 lense (made by ex Nikon opticians) for pentax K cameras.
Should work fine on new Pentax DSLRs as a manual lense.
Optically nice and clean but the diaphram is not working quiet right in auto (sticky and does not fully open sometimes) but works fine as a manual lense.
Used this on my old K1000 a few years back and gives a lovely picture.
Asking only $25
cheers Gary