Here is a great classic Goerz Dagor 21cm in the older brass style.
I did some test shots with my Sony Nex adapted to a graflok back on my Shen-Hao.
You can see it is a bit soft at f6.8, which may be nice for portaits. It is better at f8, but really shines at f16.
These samples are from an APS-C sensor, so just imagine how nice it is on 4x5, 5x7, or 8x10!
$100 plus shipping thx!