Antique Anchor Blocks Richter, Patent Anker Steinbaukasten, Real stones, popular Art Nouveau toys 1900s, construction set wooden box

Antique Anchor blocks, Patent building blocks with real stones by F. Ad Richter & Cie

Wooden case with colored lithograph label, enclosing architectural blocks in real stone.
Rare and valuable, art nouveau toys from between 1900-1920

Box is ca 26 x 17 cm.

It is possible that 1 or 2 blocks are missing, since there is no manual included.
Two blocks are broken in 2, but can be glued.