Grooved/corrugated brick

The origin of these bricks is still unknown. As far as I know all known bricks come from the same German collector.

 

Logo: modern logo

 

Material:

 

Inner wall: thick

 

Inner ribs: None

 

Inner tubes:

 

Flowrib / center line inside top surface: No.

 

Mold pip: on the stud.

 

Mold number: None.

 

Mold position numbers: None.

 

Intellectual property protection: None.

 

Design ID (3001): No.

 

Remarkable features:

• Grooves/ridges on the inside top surface.

• No mold markings

 

Colors known: Transparent light blue, transparent neon-green.

 

UNANSWERED QUESTIONS

• Where were these bricks made, and what were they used for?

• Why were these ridges made?

• Can we find more colors?

•

 

The brick does not work as a reflector.

Done