Jason,
Since we are discussing the #4319 and just that car number, not the entire Ph1 Coalcar series and this subject is near to my research of these cars of close on 35 years now.
a little challenge to your fine detective skills.
Since the #4319 was prepared for display in the Button Herald scheme I would consider a higher level of repaint preparation than the lick and a promise of the operating days. I see no shadow of Block visible in any of the number of display photos taken.
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digital.denverlibrary.org]
Photo taken by Otto Perry at BlackHawk in 1941.
Most surviving coalcars that carried the block lettering at the end of operating years had
Roman numerals re-stenciled, some with and some without the
Roman C&S initials i.e. the car number and most important repack dates were re-stenciled, the capacity data deemed irrelevant by that time and the Button herald not always applied as well.
Numerous photo examples of that latter day practice abound.