China Szechuan Province year 2 1913 200 cash

Can you please add the above coin to catalogue with km# 459.1a made of brass rather than copper.
http://www.ngccoin.com/price-guide/world/china-szechuan-province-200-cash-y-4591a-21913-cuid-43813-duid-125378

I would add this coin myself but I'm not sure if it should have a seperate km# or be added to an existing km#. Any advice would be appreciated rather than ignored.

If it is a different alloy it gets an own page, so you can create a new one.