It appears to be an old Brunswick shaft from a Brunswick Merry Widow cue or a model 204 Brunswick cue- however, those shafts from the turn of the 20th century had the joint pin in the shaft. The joint on your cue butt looks to be ivory- but, again, the antique Brunswick cue s with that matching shaft did not have the joint pin in the cue butt section.
I would say that you have some sort of hybrid cue from about 1910 or so to about 1930s. Someone may have altered both shaft and cue butt for some reason- who is to know?
Your cue shaft may have value for a person looking for that era shaft to match that era cue butt that they now own- the shaft would need to be plugged, and a new joint screw inserted into the shaft to match one's existing antique Brunswick cue butt from this era.
Alternately, a new cue butt could be constructed to match the shaft, perhaps that ivory cue butt joint could be re- purposed - but doing all this only if the shaft is reasonably straight, and someone just wanted a semblance of a playable shaft- antique era cue- not much market for that if any at all - bc it would be nowhere near a true antique Brunswick cue at that point.
Bottom line is the straightness of the shaft that someone might want to acquire as a match to one that they already own, which this one would need a cue makers hand to reconstruct the joint pin - a cost of about $150 or so from those cue maker that I know. So I see the value here, possibly, in the shaft- one to be reworked, a shaft that may sell for a $100 to $200 as is- if reasonably straight.