Coins of 
Vatican City

Italian: Stato della Città del Vaticano 

100 centisimi (single: centesimo = 1 Italian lira (plural: lire) [ITL] (until 2002)
100 cents (single: cent) = 1 euro (plural: euro) [EUR]
Symbols: ₤ (lira), € (euro)

Languages on coins: Italian, Latin
Alphabets on coins: Latin
Numerals on coins: Roman, Western Arabic
​Calendars on coins: Gregorian, Regnal years

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For more information on how to translate the year on Roman coins follow this link:

Identify year on Roman coins

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Mint Marks

Istituto Poligrafico E Zecca Dello Stato, Rome (ITA), "R"

Privy Marks

Designer Marks

Paolo Borghi (???): ".q BORGHI"

Angelo Canevari (??): "A. CANEVARI"

Eugenio Driutti (ITA): "DRIUTTI INC."

Ettore Lorenzo Frapiccini (ARG): "ELF INC."

Pietro Giampaoli (ITA)": "GIAMPAOLI"

Sergio Giandomenico (ITA): "GIANDOMENICO"

Daniela Longo (ITA): "D.L."

Luc Luycx (BEL): Superimposed "LL"

Enrico Manfrini (ITA): Stylized "E manfrini"

Aurelio Mistruzzi (?): "MISTRUZZI A.M.INC."

Nicola Morelli (ITA): "N MORELLI"

Francisco Aparicio Sanchez (?): "APARICIO"

Ennio Tesei (ITA): "ETESEI"

Guido Veroi (ITA): "VEROI"

National identification and other marks

Coat of Arms

The coat of arms of Pope Pius XII (1939-1958) consists of a central escutcheon is decorated with a dove holding a laurel leave of a lily. Behind the escutcheon are two crossed keys (Keys of Peter). The whole is superceded by the Papal Tiara. 

Drawing of coat of arms of Pope Pius XII as it appears on coins

Photograph of coat of arms of Pope Pius XII as it appears on coins

Monogram of Pope John Paul II?: "IP2" with superimposed "S"

This is my best guess of what this might be. It seems to read "IP2" which might refer to Pope John Paul II (the Pope at the time). In Latin his name was Ioannes Paulus II, hence the "I" instead of a "J". The superimposed "S" would probably stand for sovereign or superanus. 

Courtesy of www.coinz.eu