Brian R.
Wore out three sets of tires already!
After some further digging on the CABE looking for catalogues or other Columbias, I can state definitively that this bike is an 1899 Model 60. It had a wooden rear fender originally. A post by dfa242 back in 2013 under the title "For Sale: 1899 Columbia Model 60 Ladies Chainless in Original Paint" shows the exact same bike including the ABC head badge, with the one exception of the rear hub brake. The rear hub on that one is the early New Departure, which could have been an option in 1899. The original brake on my bike is still unknown; I haven't had time to take apart the rear hub yet. A CABE member helped me identify an 1899 Columbia chain-driven bike a few years ago, and I will see if I can ask him to post the catalogue page here for the Model 60.
To answer the question from locomotion, the rear hub does not have that tab for mounting a rod for a duck brake.
To answer the question from locomotion, the rear hub does not have that tab for mounting a rod for a duck brake.