Does anyone know anything regarding this German Commemorative coin?

You can find 1978 Commemorative stamps of America on about.usps.com/who-we-are/postal-history/stamps-postcards.htm

purpose of a commemorative speech

The verb of commemorative is commemorate.

As in "to commemorate something".

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.

Because the centenary was approaching they decided to issue a commemorative coin to mark the occasion.