I was able to find a death certificate for Séraphin Joseph George. He died 1900-05-01 in Marchienne-au-Pont, is cited as age 51 and 11 months, and born in Marchienne-au-Pont the son of Jean Joseph George and Marie Josèphe Badoux, and husband of Marie Thérèse Delval.
The listing in the ten year table of deaths is available at https://search.arch.be/en/zoeken-naar-archieven/zoekresultaa...
For some reason the Belgian State Archives death record images stop in 1897 but I was able to find the death certificate at FamilySearch.org (register for a free account).https://familysearch.org/ark:/61903/3:1:9Q97-Y999-G6X?cc=213...
I didn't try to find his birth certificate online, but you should be able to find it within the Belgian State Archives (and maybe also the death, marriage, and birth certificates of his parents). Note that the Belgian State Archives has parochial record images online for births, marriages, and deaths prior to 1800.
Hope this helps.
Regards, Dave Schoonaert