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Well it really doesn't matter to be honest. Looking at any story, in any series, details this minor are usually so unimportant that actually taking the time to explain it might be the same as patronizing the intelligence of the fans.
For the sake of the arguement, the most educated answer would be either Arbiter or Hood. Everyone at the memorial obviously felt some grief because they thought that their hero just died. So really anyone could have been devestated enough to scratch the number of their departed legend onto his makeshift tomb.