Posted By:
Scot ReaderTed,
I pegged the 460-only launch to the Fall of 1910 based on artwork completed the preceding Spring and Summer. So if Sovereign 460 were printed first it could explain the absence of Kleinow (Boston) and Smith (Both) with that back. And I do agree with you that these subjects are likely unavailable with Sovereign 460--if they were available we probably would have seen them by now.
Scot