Birth year & Countries from Siegmund Seybold (via Lotte Burkhardt); Obituary in: https://docplayer.nl/107790128-Omslag-dirk-jan-van-vliet-werd-geboren-op-15-september-1924-in-nieu-weveen-zh-na-de-lagere-school-ging-hij-naar-de-ambachts.html (via Boris Heuer)