Ceramic nozzle and mixing chamber

Hello.

I've never seen one like this before.
It's a one piece nozzle and mixing chamber. Is it normal?
Juan

 

One less spot that can come loose. From wich lantern is it?

 

It's from a local made Petromax. I own this lanter from many years ago but I didn't see this before.
1970's Petromax 821

 

That's a nice one. I'm pretty certain you could only get these full-ceramic ones in Argentina.

 

That's a first!

 

For Argentina yes, for europe not.

But having written this: I have 500cp nozzles with a "pip". This pip or pillar makes it possible to tie the mantle bottom on it.
But originally they are for a Bullfinch gas lamp.