June 7, 2015: Blackboards from 1917

[Lamplighter]

Nice analysis, DJ

I'm wondering if the hexagons above your multiplication circle are "shields of David" indicating a Jewish presence.

That is, there is a mention of the Dutch and moving to the Netherlands...
And wikipedia says the following:

Most history of the Jews in the Netherlands was generated between the end of the 16th century and World War II.
The area now known as the Netherlands was once part of the Spanish Empire but in 1581, the northern Dutch provinces declared independence. A principal motive was a wish to practice Protestant Christianity, then forbidden under Spanish rule, and so religious tolerance was effectively an important constitutional element of the newly independent state. This inevitably attracted the attention of Jews who were religiously oppressed in many parts of the world.