You can find attached a picture of 2 saudi arabic stamps ( red ) with value 20 piastres .
I think they are notarial stamps
I could not find any stamps looking like them in any catalogue or websites .
Especialy they do not have an overprint .
All what I have found stamps with low value 1 and 2 piastres . And they are all have overprint .
You can find there pictures below .
I need any informations or catalogue picture .