Have you ever seen something alike? Tsar Nicholas II letter clip

[Stuka f]

looks like pewter but weights like bronze, no marking.
It is 22.5 by 11 cm and weights nearly 1 kg!

[Bayern]

Hello : to me is Great Duke Nicholas and not Tsar Nicholas 

[Wild Card]

I had the same impression

[Egorka]

Grand Duke Nicholas Nikolaevich of Russia (1856–1929).

 

[Stuka f]

Ok, thanks for your input!

And what is it made for? Letter clip...? 

[Bayern]

Hello , not probably, but as portable schreibtisch ,sic ,i not find the right english word.