However, mine is magnetic, so it can't be bronze, it must be bronze plated steel. Is it rarer, or is it just an error in the catalog? In Krause and on the Swaziland's Central Bank's site it's marked as bronze too: http://www.centralbank.org.sz/currency/coins/SwazilandCoinsHistory.pdf
PS: If you click on a coin image in the PDF, it redirects to Numista
It is a mistake in WCC, in Schoen catalog composition of the coin is copper plated still so it is supposed to be magnetic. Non-magnetic coin doesn't exist.
Ang numismatika ay libangan ng pag-aaral ng barya at perang papel.
Numismatics is the hobby on studying coins and banknotes
Numismatik adalah hiburan pelajaran uang logam dan uang kertas.