Here's my example of this coin type: It's from Hungary, struck by the king Bela III (1172- 1196). Obverse shows Bela and his brother Stephen enthroned, reverse shows the Virgin Mary.
I don't have a scale handy, but the diameter of my coin is 28 mm. It is very thin, and I believe it may have originally been slightly scyphate (cup-shaped) and then someone tried to flatten it out, creating the large cuts in the flan.
@expat The above information is spot on. To learn a little moreabout the coin go to "acsearch.info" and Google "Bela III". This search will bring up 100's coins that have been auctioned. Some have description of just the coin, others may give a little history. ie.: Description World HUNGARY. Béla III, 1172-1196. Rézpénz (Bronze, 27 mm, 3.26 g, 8 h). +SANCTA ARIA The Virgin Mary, nimbate, seated facing on throne, holding scepter in her right hand and Child Jesus in her left. Rev. RЄX BЄLA RЄX STS Bela III and Stephen III enthroned facing within Gothic niche, wearing crowns surmounted by crosses, each holding long scepter in right hand and globus cruciger in left; above, cross. Huszár 72. Réthy 98. A very attractive and sharply struck example. Extremely fine. Style and fabric of this type closely resemble the famous Byzantine Trachy coinage, attesting the deep cultural influence the empire exerted over southeastern Europe. It is worth noting that Bela himself was sent to Constantinopolis by his older brother Stephen at the age of 15 years, where he grew up at the court of Manuel I Comnenus. Like so many foreign princes before him, the young Bela must have been deeply impressed by the magnificent and highly cultivated capital of the venerable Empire. He eventually got engaged with Maria, Manuel's daughter, and adopted the name Alexios when he became the Byzantine crown prince in 1165. However, when a son was born to Manuel I in 1169, Bela lost his rank and his engagement with Maria was dissolved, laying the foundation for his return to Hungary in 1172 when his brother Stephan was poisoned. Description World HUNGARY. Béla III, 1172-1196. Rézpénz (Bronze, 23 mm, 1.40 g, 10 h). Pseudo-Kufic legend in inner field and outer margin. Rev. Pseudo-Kufic legend in inner field and outer margin. Huszár 73. Réthy 101-103. Minor areas of weakness and with four minor cracks along the edge, otherwise, good very fine. When the body of Bela III and his wife Agnes of Antiocha were found in 1848, among the artifacts discovered in their grave was a beautiful ring with the Kufic inscription 'Abdallah ibn Muhammad' ('Abdallah son of Muhammad' in Kufic). This fascinating personal jewelry attests the King's fondness for Islamic art, as do his coins with Pseudo-Kufic legends. The prototype for the present issue was first identified by P. T. Nagy. It is a dinar struck by the ruler of Murcia in al-Andalus, 'Abdallah ibn 'Iyad (AH 540-543 = AD 1145-1147) (Cf. P. T. Nagy: 'Islamic” Artifacts in Hungary from the Reign of Bela III (1172-1196): Two Case Studies', in: Annual of Medieval Studies at CEU 22 (2016), p. 55).
