What kind of brick is this?

[TF83]

Hello!

I have found some boxes full of "new old" bricks here at home. And I was wondering if anyone knows what kind of bricks they are? Just "ordinary" black glazed ones or something else, do you think?
They are 22cm long, 5cm wide and 5cm high.

Grateful for any help

Best regards, Tommy

 

[anaitis]

Called pettringar.
Use e.g. to cover wooden houses if you don't want it to be too thick of a layer.

 

[TF83]

Thank you very much for that info!

Best regards, Tommy