The entire table screams mid century to me !! Specifically the 60`s !! Everything from the capped screw holes to how the legs are turned combined with the shape !! The stretcher is a different wood and since it is pretty consistently the same color,,its likely it was stained !! Don`t think it had casters, I do think it had those tips that kept it from scratching floors !! I have seen a couple of pieces that were similarly made as far as the fretwork,,Cant remember where I saw them but it was in the process of researching something that was posted on another forum !! The way the fretwork is used gives the legs a winged look to me and since it was something different I studied it a few minutes !!
Like Jacon4 said without actually doing a hands on and seeing more that what we can with pics,,all we can do is a best guess scenario !! But I would put money on 60`s !!