Chinese / Asian unknown coin, any ideas?

[Whybuywhenyoucandiggemup]

Hi! This is my first post on here, wondering if anyone recognises this or could point me in right direction with age or origin? I have had many similar before but the symbols are different on this and the metal seems more like tin than the usual copper or bronze.

Thanks in advance - Mike

[azda]

Chinese cash money, but being chinese is could be a reproduction.

[scott]

Board of Public Works marks make it Ch'ing dynasty, however the 4 characters don't match anything that should be there, so perhaps a charm.

[copper123]

These are also repro in china and sold to tourists as cheap souvenirs , Millions are spread over the whole world now , so please don't get excited it might be genuine it prob isn't