Richter Stone Union Building Blocks Complete Set No. 6 in Original Box with Booklet flag cards above it I believe is

above it I believe is the alphabet repeated three times

and Binney & Smith

with wonderfully detailed trees

a pencil written message from a S

has holes all around the perimeter that would have been threaded with twine or yarn in order to keep the slate from banging on the surface of a school desk--thus chalkboards like this are often called "silent" chalkboards

Richter Stone Union Building Blocks Complete Set No. 6 in Original Box with Booklet flag cards above it I believe isI've long been admiring sets of stone blocks like this for years, but never have I come across a complete set, in excellent condition, in the original. box with slide top lid, and with the original design booklet showing examples of many structures one might build with them, and an extra booklet (from another set) to boot! This Union Building Blocks No. 6 set was produced by Richter & Cie Rudolstadt, Germany c. 1900 and weighs in at just over 7