We just finished a remodel of our old 100yr old home and lost an interior door knob.

I'd like to replace it but have no idea what kind it is. I could use some help identifying the manufacturer, type, etc.

Here are 3 photos https://www.dropbox.com/sh/sxmr5u8b8tcm3e3/U0SDldnBzD
(I couldn't post them here because they are too large.)

Let me know if you need more information (measurements, etc.). THanks