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I agree with canyoneer, I would prefer a US Specialized Classic 1847-1940
As noted elsewhere, the cut off really needs to be through 1945 so as to not split the war period.
That said, my suggestion is three volumes:
Through 1900, updated every five years.
1901 through 2000, updated yearly.
21st Century, updated yearly.
OR as True 19th (through 1902), 20th (1899 through 2001) and 21st (1999 through date) centuries with a two year overlap [Meaning 1900 and 1901 would be in the 20th and 2000 and 2001 would be in the 21st.] This would allow for the listing of issues which would be found used shortly after listing date.
The first volume would be a rather static edition as there is little "new" information found to update each year. The essays and proofs could be restored, in the older more detailed manner and expanded, e.g. to include the trial essays of various grills and trial cancellation tests of same. The identifier of regular issues could return. Annual pricing changes could still be found in the graded pricing catalog.
The second volume could still include the essays and proofs, new information as it is discovered, expansion of the
on cover listings as well as being the volume targeted to improve the revenue listings. Again the identifier of regular issues could be returned.
The last volume would expand each year due to the new issues and counterfeits. Much back of the book would not be present as little BOB was issued post 2000.