David Thompson scan
A most reliable contributor, even after many years, David Thompson, sent in this scan of an R173 with a special margin inscription that includes a denomination notation (with $ sign!) and what are likely to be siderographer's initials.
Cancel notes: The year date is obviously wrong and should be 1899. And we could be looking at a Northwestern Mutual Life cancel, though the N is oddly shaped. I've been away from these cancels too long. Any other possibilities/certainties? Could it be HMLI?