So, just to be clear, you've come to think that the first postcard was sent to Jacob Van Dyk through the care of Mr. H. Rietberg and that Mr. Van Dyk was possibly a lodger with Mr. H. Rietberg in Amsterdam.
My grandparents were all Polish and came here in the early 1910's.
Possibly your Jacob Rietberg didn't stay in the U. S. and moved on to Canada or went back to Holland, or maybe any documents pertaining to him just haven't been transcribed to to any searchable databases that are on the internet yet.
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