I will start off with this example.... AV 5 Piastres AH 1288 (1871) Tunis Mint Muhammad III al-Sadiq (Bey of Tunis) along with Abdul Aziz I Sultan of the Ottoman Empire
Here's Vabalathus and Aurelian on opposite sides of the same coin. (Picture stolen from @Mat - I used to own the coin, but he does now.) This silver didrachm from Ptolemaic Egypt was issued by Ptolemy VI ("Philometer"), but shows the portrait of Ptolemy I ("Soter").
A William and Mary tin halfpenny with a copper plug in the centre. Not my coin unfortunately as one in this grade is almost impossible to find but a beautiful coin all the same
In 2014, the new King of Spain took rule after the abdication of his Father. Here is father and son on a 2 Euro coin
Brandenburg-Franconia Obverse: Two 1/2-length figures facing one another, date above, titles of 2 margraves Obverse Legend: D: G: GEOR(G) : : & : ALBERT: MARCHIO(N): BR(AN)(D): &: S(L)(E): Reverse: Floriated cross, small shield of arms in each angle, Brandenburg arms in center Reverse Legend: SI. DEVS. PRO NOBIS. QVIS. CONTRA. NOS. Ruler: Georg and Albrecht II Note: Dav. #8967. Mint: Schwabach Mint Master: Wolf Ubeck Composition: Silver Diameter: 40mm
My last day of work We are getting 20 cm. of snow tonite. Salzburg/ Erzbistum AV 2 Dukaten 1582 Salzburg Mint/ Prince/ Archbishop Jakob Johann Von Kheun-Belasi Coin cites Holy Roman Emperor Rudolf II
Byzantine Empire AV Solidus ND Constantinople Mint Constans III 641-58 AD Emperor on obverse Three future Emperors (Sons) on reverse
There is plenty of Spanish colonial gold coinage of Charles III showing the bust of Ferdinand VI with a Charles III inscription, and not just in the transitional year, but for the next 10 or so.
