+1, the stays attaching to the top tube, just in front of the seat tube are a Columbia characteristic. The Ashtabula crankset, block pedals and Huret Allvit derailleurs and sidepull brakes point towards a boom era model 5610 city bicycle that has been converted to drop bars and stripped of the mattress saddle and post. These USA made, boom era, entry level models tended to use either 13/16 (21.15mm) or 7/8" (22.2mm) posts, though I don't remember which Columbis used. The latter is still common on inexpensive BMX bicycles.
This bicycle is bottom of the barrel. In addition to the missing saddle, chain, seat and bar tape, it looks like the pulleys on the rear derailleurs toggle wheel (and possibly the jockey wheel) appear broken or very worn. I don't think this is worth the money, considering what you would have to put into it, unless you already have the parts sitting in a stash bin. Lastly, this is a lugless frame, from a period and level where lugs actually contributed to the reliabilty of a frame.