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The stamps were jointly issued by USA (SG2028) and West Germany (SG2030) to commemorate German emigrants.
From their correspondence a few details emerge.
Thirteen families from Crefeld on the Lower Rhine near the Dutch Border left their homeland for a better life in the New World. They travelled to England and took passage on the CONCORD, a London ship of 500 tons burden, which sailed from Gravesend on 25 July with William Jefferies as Master.
After a crossing of nearly 11 weeks due to contrary winds tempest and thunder storms typical of the time of year, they arrived in Philadelphia on 6 October. Here they settled, building a German town on the northern outskirts of the of the town and became the advance guard of the great German migrations.
The writer does not give the year but the stamp says 1683.

J Duhaut. Log Book January 1990

Germany SG2030, USA SG2028. (Gibbons mentions a Dahomey stamp for this ship, but that is wrong.)

There is an interesting follow up to the stamps showing the ship Concord which involves Samuel Cunard the founder of Cunard Line and Charles Pete Conrad the astronaut of Apollo 12 who walked on the moon in 1969.

The story of the Cunards in America begins with the bold journey of thirteen families from religious persecution in 17th century Germany to the freedom and opportunity of the new world. Thones Kunders, a dyer by trade and Quaker by faith, left Krefeld, Germany with his wife and three young sons in the summer of 1683. After travelling to Rotterdam, they sailed to London to await their passage to America. They sailed to the colonies on the Concord. Over the years members of the family changed the family name from Kunders to Cunard and Conrad and included among the descendants of Thones Kunders were Samuel Cunard, the founder of the Cunard Shipping Line and Charles Pete Conrad, an astronaut of five missions including a walk on the moon in Apollo XII in 1969.

Bhutan 1990 15nu sg?, scott907. (in margin of MS)