I only have the ½ dinar and both parts are definitely magnetic, consistent with what we currently have. The use of brass- and nickel-plated steel in this coin gives a clue as to what the lower denominations could be made of.
Former Numista referee for banknotes from Ireland, Northern Ireland, Scotland, Wales and Saint Helena.
Based on ½ Dinar - I updated other three coins. Given your research in this thread, I took calculated guess, because coins are magnetic. Now we have unbased and probably correct information instead of clearly wrong one, which is improvement IMHO.
A short comment on the uncertainty would seem appropriate. Perhaps:
The composition of this coin is stated in SCWC to be cupro-nickel. However, these coins are magnetic. The composition is therefore given here as nickel-plated steel but this has yet to be confirmed.
Former Numista referee for banknotes from Ireland, Northern Ireland, Scotland, Wales and Saint Helena.