I have what I am fairly sure is an original Sargent door knob set that is FREE to the first person that can make arrangements to pick it up from me in Terra Linda.
The set was on our master bath door. The outer knob is bronze/copper (not in great shape, dull on about half the knob) and the inner knob is chrome with a push lock (much better condition, but not perfect). I believe the push lock doesn't work and needs a spring or something. I have the strikeplate, too, and all the screws.
Anyway, if you are interested, write me at firstname.lastname@example.org