Łódź Ghetto 10 mark 1943 AL-Mg

What do You think, genuine or fake ? Is at the auction and I want to buy it.

weight:1,42 g 

For me weight is little bit to small, but maybe its because corrosion and use of thin sheet metal.

On polish forum they say its genuine, however i want to be sure.

Sorry for my english im still learning this language.

I would be very carefully with this coin, I learn there a much more fakes around as the originals.

I know, but this one is in bad condition and the fakes are less likely to be styled like that, also it comes from respected and popular numismatic antiquarian. Additionally, the price is not excessive, so its not gonna hurt if it turns out to be a fake. 

In that case I would buy it.