Old French Pieces - One Of Letzeburg?

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Now, to your coins...

"Letzeburg" is German (or perhaps Luxembourgish) for "Luxembourg" and appears sometimes on their coins.

The aluminium ones with "Travail Familie Patrie" were issued during WWII by the collaborationist Vichy State.

The 1920 half franc is from Switzerland; both it and the old 50 centimes are made of silver.

Just some additions to the Luxembourg coin.
Letzeburg (or Letzebuerg in the new spelling) is the Luxembourgish word for the country. On the modern coins you will only find legends in French or Luxemburgish on the coins.
Your coin has been first released in 1952 and could be found in circulation until +/-1989. In 1965 a new type has been released with the head of the New Grand-Duke. In the early 80s people started to collect this coin and it had almost completely disappeared from circulation.
The coin is still well known in Luxembourg as Feierstepler.