I believe this is a souvenir/collectable pin for when you visited the specific historical building. It is made of a carved white celluloid base. The obverse shows the Die Pfalz Castle (Built in the 1300s, this unique castle was used to collect tolls from ships sailing on the river) it is surrounded by a boarder that reads "Die Pfalz Gau Hessen Nassau". The reverse shows a full white back with a steel well working pin. A cool piece!
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