When I had a chance to buy a Schmidt Rubin from a collection that was being parcelled out, I chose a K-11, as it simply felt "slicker" than the K-31s in the bunch.

If i had been REALLY flush, however, I would have grabbed the ZFK-55 package. Alternately, my wife might have noticed the missing children that had been sold to pay the asking price.

The bloke (sans children but with a very understanding spouse) who bought it let me whack some GP-11 down-range with it: VERY nice piece if kit.