Coin of King Saud, may God have mercy on him and forgive him, 2 Qirsh, dates 1376 and 1379, 11 pieces available. Old paper or metal currency that is no longer in circulation (not used for buying and selling) may be sold for more than its face value (buying and selling), and it is considered a collectible item, not a currency. Immediate exchange is not required, according to the opinion of Sheikh Abdulsalam Al-Sulaiman, Sheikh Dr. Ali bin Abdulaziz Al-Shibl, and His Excellency Sheikh - YouTube. Its exit from being currency: If the paper or metal currency is no longer a "price" and is not used in transactions, it becomes a "commodity" that can be sold for more than its value (e.g., an old Riyal for 100 Riyals), and there is no harm in that. Immediate exchange is not required. Metal coins (gold/silver): If the old currency is gold or silver and is still valued by its weight, it must be sold like for like with immediate exchange. However, if it is sold as a "curiosity" or "artifact", it has the ruling of a commodity, according to YouTube, and YouTube.