Hi Cheetah. I just happened to spot your request. Feel free to PM me, anytime.
Brunk doesn't happen to list a W.SAGE c/s, nor does Rulau. There may be more out there, but I can't recall seeing one. I did a search on this and couldn't reap any leads. Given a few dozen William Sages I found in early city directories, all had middle initials. Of course, there are other first names that begin with a W, yet none are so common as William. The presence of a middle initial often helps in attribution. In this case, the lack of one may eventually prove helpful. If I can come up with any prospects, I'll let you know.
P.S.- That's a most appealing assortment of acquisitions from Baltimore. You have a fine eye!