Plastic casts of crystal models
Unsigned, first half 20th century
58 transparent light orange casts of crystal models. Dimensions between 3 and 7 cm. Some of the models were numbered which allowed them to be identified as casts of a set of Krantz wooden crystal models. The original Krantz models belonged to the set of 150 models, arranged by C. Hintze, fully described in their catalog 8a 2nd ed. 
and mentioned in later catalogs (e.g. catalog 29 2nd ed. 
on page 12).
collection R. Dedeyne