All of the coins shown seem to be types expected in the poster's homeland. By coincidence, there is a paper by Amelia Dowler of the British Museum in the Autumn 2018
Journal of the Oriental Numismatic Society entitled 'The Interaction of Aksumite and Roman Gold Coins in South Arabia in the 6th Century CE' (pp. 5-20). It should appear online eventually either at
www.orientalnumismaticsociety.org or
https://britishmuseum.academia.edu/AmeliaDowler.
I might be able to identify the Islamic coin if a photo of the other side can be added.
Edited by Kushanshah
11/22/2018 4:47 pm