Richter Stone Union Building Blocks Complete Set No. 6 in Original Box with BookletI'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