Coins of 
Luxembourg

Luxembourgish: Groussherzogtum Lëtzebuerg, French: Grand-Duché de Luxembourg, German: Großherzogtum Luxemburg 

100 cent(ime)s (single: cent(ime)) = 1 Luxembourg franc/g/k (plural: francs/frang/franken) [LUF] (until 2002)
100 cents (single: cent) = 1 euro (plural: euro) [EUR]
Symbol: fr., F (franc), c (centime), CTS/CES/CMES (centimes)

Languages on coins: French
Alphabets on coins: Latin
Numerals on coins: Western Arabic
​Calendars on coins: Gregorian

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Mint Marks

Koninklijke Munt van België - Monnaie Royal de Belgique, Brussels (BEL): Head of Archangel Michael 

Günzburg Mint, Günzburg (DEU): "H"

Rahapaja Oy - Myntverket i Finland, Vantaa-Helsinki (FIN): Capital letter "S" or cornucopia

Monnaie de Paris, Pessac (FRA): Cornucopia or "F" in star or "A"

Koninklijke Nederlandse Munt, Utrecht (NLD): Caduceus 

Note: this mark was also used on some coins, even though they were struck at the Brussels Mint (BEL).

Privy Marks

Lambert Joseph Emmanuel Servais (LUX), 1853-1857, 1869, Roman sword

Note: there was a dispute about this mark between Luxembourg and the Netherlands. This mark was used on coins which were struck at the Brussels Mint ​(BEL) with the mint mark of Utrecht (NLD). Luxembourg claimed that this was the mark of Servais, even though it was also the mark of the Utrecht mint master Van den Wall Bake in the same period.

Désiré-Albert Barre (FRA), 1855-1878, anchor (French: ancre)

Graveur Général of the Paris Mint (FRA)

 Charles-Louis Dierickx, 1845-1860: Hand (French: main)

Directeur d'Atelier of the Paris Mint (FRA)

Robert Vogeleer (BEL), 1963 - 1987, Stylized blackbird with "V" on chest (Dutch: merel​)

Erik J. van Schouwenburg (NLD), 2000: bow and arrow with star (Dutch: pijl en boog met ster​)

Maarten T. Brouwer (NLD), 2003 - present: sailboat or course setting sails (Dutch: zeilboot / koerszettende zeilen​)

Hubert Larivière (FRA), 2004-present: horn with waves and fish (Dutch: hoorn met golven en vis​)

Designer Marks

François Barth-Wahl (???): "BARTH"

Armand Bonnetain (BEL): "A.B", "A.B.", "A. B." or "A. .B."

Alexandre Everaerts (?): "EVERAERTS"

Yvette Gastauer-Claire (LUX): Superimposed "YGL"

Julien and Nina Lefèvre (LUX): "J.N. LEFEVRE", "JN LEFEVRE", "J.N.L.", "N.J.L."

Luc Luycx (BEL): Superimposed "LL"

Alphonse Michaux (BEL): "A. MICHAUX"

Giorgos Stamatopoulos (GRC): Greek capital letters gamma and sigma  "ΓΣ"

National identification and other marks

Coat of Arms of Luxembourg

The (lesser) coat of arms of Luxembourg shows a shield with a rampant two-tailed lion. Underneath the lion are ten bars of silver and azure. Above the shield a crown is placed.

Photograph of the Coat of Arms of Luxembourg as it appears on coins

Drawing of the Coat of Arms of Luxembourg as it appears on coins

Monograms

Monogram of Charlotte I: stylized superimposed "C" and "h" with crown

The monogram depicts the letters "C" and "h", the first letters of the first name of the Grand-Duchess of Luxembourg, Charlotte I, 1919-1964.

Monogram of Henri I: crowned "H"

The monogram depicts the crowned letter "H", the first letter of the first name of the Grand Duke of Luxembourg, Henri I, 2000-present.

Other Marks

Institut Monétaire Luxembourgeois, Luxembourg (LUX): "IML"

The IML is the national bank of Luxembourg since 1983

National mark of coins of Luxembourg

Note: I could not find any other significance...