So, my theory would be that whichever decal was in use in mid to late 1904 would be "correct"...
As to the earlier question about whether or not a B would still have a banner decal, I checked on my Home B with a banner decal today - it is serial # H 163271. Definitely a B, with lever-lock on the end-gate, and one-piece upper-casting, etc. The upper-works and case look equally decrepit, so my hunch is that this machine is unmolested.
Updated - found a picture of my "Banner B"... main reason I bought this wreck was to get the "Pansy" Tea-Tray Co. Horn that was with it...