asian Tetsubin in copper

i guess japanese or korean?
and is it be around 1900-1920?
is the reign mark known by someone?
help appreciated as usually

I would say Japanese, and agree it's likely to be early 20th Century.
As for what the mark stands for, I wouldn't like to say. It might simply be the place of manufacture or the name of the maker.

damn   
i've hoped your supercomputerbrain may extract the information who this mark belongs to... this will take ages though

Traditional Japanese tetsubin are made of cast iron and this is not a traditional shape either.

Not saying that it wasn't made in Japan but it was almost certainly made for the European market.

that's possible true...
i hardly find any copper tetsubin at all...

.... it was almost certainly made for the European market.

Agreed. Very much a teapot in the Western tradition.