Cambodia 5 Sen 1979 SCWC Errors

These comments are for this coin:

N#7436

The SCWC lists the weight of this coin as 2.49 grams and the diameter of this coin as 20.39 mm.

My specimen of this coin weighs 1.477 grams and is 22.03 mm in diameter. These values are good matches for the listed Numista values of 1.5 grams and 22 mm.

Question: Should there be a comment on the Numista page for this coin that the weight and diameter values given in the SCWC for this coin are not correct and that the Numista values are the correct ones?

The Numista web page for this page states its composition is “magnesium clad aluminum”. The SCWC lists the alloy for this coin as just “aluminum.” Which source is correct? What is the reference/source for the not commonly encountered “magnesium clad aluminum” alloy information on the Numista web page for this coin?

Yes, if Numista differs from a popular catalog a comment is a good idea unless we want the possibility of regularly change requests.
Highly unlikely that magnesium clad coins exists (if at all they would be plated) but Magnesium-Aluminium alloys are very common.