Here are some coins, all in copper, I just bought in Morocco and they seem to be older than Alawi Sharifs...
Sorry, I have not my weighing machine here....
C1) This one is 18-20 mm and seems to be from sa'dian sharifs:
What is the reference book for sa'dian sharifs coins?
C2) This one is the smallest one (1/2 fulus?) around 12-14 mm
C3) this one is 16-18 mm
C4) 16-20 mm
C5) the latest one is quite thick (2mm) and around 16 mm
Thanks,
yvevmax