Harm de Vries, born in 1903, was the son of Boelke de Vries and Lena.
Here is his marriage announcement, which I found online. He married Trintje Wilhelms née Fittje. I found this in the digital library by visiting Ostfriesische Landschaft, Digital publications, Historical publications on state history and new academic online publications.
Harm lived in Lammertsfehn, also referred to as STALLBRÜGGERFELD – LAMMERTSFEHN in Leer (Lower Saxony).in Leer county, Filsum commune.
The population was 610 as recorded in the 2011 Census.
Leer: district in Lower Saxony, Germany – Inception: 1885